Question
Asked Oct 31, 2019
 
 
Suppose the lengths of the pregnancies of a certain animal are approximately normally distributed with mean μ=272 days and standard deviation σ=19 days.

What is the probability that a random sample of 51 pregnancies has a mean gestation period of 265 days or​ less?

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Expert Answer

Step 1

From the given information,

Mean (μ) =272days and standard deviation (σ) =19days

Sample size (n) =51

Step 2

Let ‘X’ be a normal distribution of a random variable

Now, standard deviation for sample mean is

n
19
51
= 2.67
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n 19 51 = 2.67

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Step 3

Now, probability for a mean gestatio...

265-272
х-и
P(X 265)-P
2.67
х
=P(Z-2.62)
(from the satandard normal distribution table)
P(X2650.00379
2. P(X 265 0.0038
help_outline

Image Transcriptionclose

265-272 х-и P(X 265)-P 2.67 х =P(Z-2.62) (from the satandard normal distribution table) P(X2650.00379 2. P(X 265 0.0038

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