Question

The length of human pregnancies from conception to birth varies according to a distribution that can...

The length of human pregnancies from conception to birth varies according to a distribution that can be modeled by a normal random variable with mean 265 days and standard deviation 15days.

Question 1. What percent of pregnancies last less than 240 days?  Note that the answer is requested as a percent. Use 2 decimal places in your answer.

ANSWER: 4.78%

Question 2. What percent of pregnancies last between 240 and 270 days? Note that the answer is requested as a percent. Use 2 decimal places in your answer.

ANSWER: 58.28%

Question 3. The longest 20% of pregnancies last at least how many days? (round to the nearest whole day)

days.

Math   Statistics-And-Probability   
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Answer #1

NOTE : Here Z Values are rounded to '2' decimals.

if, Z values do not round final answers will be (a) 4.78 % (b) 58.28

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