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a) P(x<78)

/in /by

a) P(x<78)

style=”color:rgb(0,0,0);”>b) P(x>86)

c) P(83<x<89)

2. The mean incubation time for a type of fertilized egg kept at 100.1^F is 21 days. Suppose that the incubation times are approximately normally distributed with a standard deviation of 1 day.

(a) what is the probability that a randomly selected fertilized egg hatches in less than 19 days? ____

(b) what is the probability that a randomly selected fertilized egg hatches between 20-21 days?____

(c)what is the probability that a randomly selected fertilized egg takes over 23 days to hatch?____

3. The mean height of women is country (ages 20-29) is 64.3 inches. A random sample of 60 women in this age group is selected. What is the probability that the mean height for the sample is greater than 65 inches? Assume sigma=2.69.

The probability that the mean height for the sample is greater than 65 inches is ____. (Round to four decimal places as needed)

 
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