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Assume that females have pulse rates that are normally distributed with a mean of j = 74.0 beats per minute and a standard deviation of o = 12.5 beats per minute. Complete parts (a) through (c) below.
a. If 1 adult female is randomly selected, find the probability that her pulse rate is between 70 beats per minute and 78 beats per minute.
The probability is
(Round to four decimal places as needed.)
Enter your answer in the answer box and then click Check Answer
2 parts
remaining
Answers
Let X be a random variable denoting pulse rates of females as described, with mean µ = 74.0 bpm and standard deviation σ = 12.5 bpm. Then
P(70 < X < 78) = P((70 - µ)/σ < (X - µ)/σ < (78 - µ)/σ)
… = P(-0.32 < Z < 0.32)
… = P(Z < 0.32) - P(Z < -0.32)
… ≈ 0.6255 - 0.3745
… ≈ 0.2510
where Z is normally distributed with mean 0 and s.d. 1.
• • •
Next, you sample 25 females from the population and want to find the probability that their average falls between 70 and 78 bpm. Let [tex]X_i[/tex] denote the pulse rate of the i-th woman from the sample, and let Y be the random variable for the sample mean; that is,
[tex]Y=\displaystyle\sum_{i=1}^{25}\frac{X_i}{25}[/tex]
Recall that a sample of size n taken from a normal distribution with mean µ and s.d. σ has a mean that is also normally distributed with mean µ and s.d. σ/√n.
The mean stays the same, µ = 74.0, but now the s.d. is σ/√n = σ/5 = 2.5. So we have
P(70 < Y < 78) = P((70 - µ)/(σ/5) < (Y - µ)/(σ/5) < (78 - µ)/(σ/5))
… = P(-1.6 < Z < 1.6)
… = P(Z < 1.6) - P(Z < -1.6)
… ≈ 0.9452 - 0.0548
… ≈ 0.8904
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Step-by-step explanation:
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Answer:
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therefore $4.2 is the cost for one tablet
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9514 1404 393
Answer:
x^2 +(y -61)^2 = 625/36
Step-by-step explanation:
The graph of the above equation is attached.
If the circumference of the wheel is 25π/3 feet, the diameter is ...
d = C/π = (25/3π)/π = 25/3 . . . feet, about 8.33 feet
The radius will be half that value, or 25/6 feet.
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(x -h)^2 +(y -k)^2 = r^2
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This means we apparently want the equation for a circle of radius 25/6 feet with a center that is (x, y) = (0, 61). The equation of this circle is ...
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If square ABCD is similar to square WXYZ and AB = 35 , AD = 30 , and WX = 42 , find WZ
Answers
Answer:
35.5
Step-by-step explanation:
PLEASE HELP! 10 POINTS.
Answers
2x+30=-50
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x= - 40Answer:
-40
Step-by-step explanation:
cuz 2 times -40=-80 and -80+30 equals -50
What is the height of a triangle whose base is 36 inches area is 234 Square inches
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hope this helps!
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Answer:
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Determine the measure of side AC. Round to the nearest tenth.
Answers
Answer:
Solution given:
sin 52°=perpendicular/base
sin52°=AB/AC
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Answers
Answer:
1.5 meters
Step-by-step explanation:
the fabric is 4 meters long
first piece is 1.25 meters long
second piece will be (4-1.25)=2.75 meters long
therefore the second piece is (2.75-1.25) meters longer
Answer:
1.5 meters
Step-by-step explanation:
4 meters - 1.25 meters=2.75m is the length of the second one.
But when they ask how much longer , I think they want you to compare the two pieces meaning to get the answer you have to take 2.75m-1.25m=1.5m thats how much longer the 2nd fabric is longer than the other one.
hope am right
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Answer:
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Step-by-step explanation:
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Answer:
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Step-by-step explanation:
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You must use a number line!
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PLZ HELP ILL PUT BRAINLIEST
Answers
Answer:
n= 9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,56,57
Step-by-step explanation:
just add those to 5 bammmmmmmmmmmmmmmmmmmm
Each square on the grid represents 1 square yard. What is the area of the octagon?
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Answers
Answer:
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hope this answer helps you......
Find the mussing numbers
13315
+ ****
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Answers
you are missing 11553
can i have brain
Answer:
ok here is all you do
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Step-by-step explanation:
Help me for free Brainliest
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Answer:
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Step-by-step explanation:
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C
Step-by-step explanation:
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Answers
Answer:
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Step-by-step explanation:
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Answers
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2
Step-by-step explanation:
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Answers
Answer:
Step-by-step explanation:
80
Answer Explanation: 12 ÷ 15%
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Answers
Answer:
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Step-by-step explanation:
X= 2
just make a graph and you got the answer
.
The value of the x-intercept if f passes through the points (-8,-2) and (4,4), is -4 and the equation of the line is 2y -x = 4.
What is function?Each element of X receives exactly one element of Y when a function from one set to the other is used. The sets X and Y are collectively referred to as the function's domain and co-domain, respectively.
Given:
The graph of linear function f passes through the points (-8,-2) and (4,4),
Calculate the equation of the line as shown below,
y - 4 = [4-(-2) / 4 - (-8)](x - 4)
y - 4 = 6 / 12 (x - 4)
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2y - 8 = x - 4
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Answers
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Answer:
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Step-by-step explanation:
ms. lorenz needs to rent a car for 3 days. she can choose from two plans. plan a costs $60 per day. plan b costs $30 per day plus $.40 for each mile she drives. ms lorenz decides that plan b will cost her less than plan a. write and solve an inequality to represent the number of miles, m, that ms. lorenz expects to drive. PLEASE HELP!!!
Answers
Answer:
distance driven < 300 miles.
Step-by-step explanation:
Plan A
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1 day costs 60 dollars
3 days cost 60*3 = 180 So this is the maximum amount that she can spend
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She still needs the car for 3 days
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Answer
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Answers
9514 1404 393
Answer:
=
Step-by-step explanation:
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A plane flying horizontally at an altitude of 1 mi and a speed of 580 mi/h passes directly over a radar station. Find the rate at which the distance from the plane to the station is increasing when it is 4 mi away from the station. (Round your answer to the nearest whole number.) mi/h
Answers
Answer:
A plane flying horizontally at an altitude of 1 mi. and a speed of 500 mi ./hr. passes directly over a radar station. Find the rate at which the distance from the plane to the station is increasing ex when it is 2 mi. away
What is the answer help please if you give me a link I will report you
Answers
Answer:
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Step-by-step explanation:
The median is always the middle number.
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Answers
Answer:
68/1000
Step-by-step explanation:
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0.9=10^(-e)×0.001
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Answers
Answer:
blah blah blah blah blah blah blah blah blah
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A 146 ≤ 9d + 10
B 146 ≥ 9d + 10
C 146 ≤ 10d + 9
D 146 ≥ 10d + 9
Answers
Answer:
The answer should be letter D (146 ≥ 10d + 9)
Step-by-step explanation:
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Answers
Answer:
V=480 in^3
Step-by-step explanation:
Use the formula
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Answer:
12 pints
Step-by-step explanation:
Answer:
12
Step-by-step explanation:
Basically you need to use ratios using the gallons and pints
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Answers
Answer:
d. what school do you go to?
Step-by-step explanation:
9.5/19=x/30 solve the proportion
Answers
Answer:
Step-by-step explanation:
Multiply (9.5)(30)=19x
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Answer:
x = 15
Step-by-step explanation: