#2 Name 1sad conten 2. (10pts) Tennis balls shot from a \"Polish cannon\" go dis

Question

#2

Name 1sad conten 2. (10pts) Tennis balls shot from a "Polish cannon" go distances that are normally distributed with mean = 100 feet and standard deviation = 10 feet. If we fire 9 balls, find the probability that the mean distance for the 9 balls is more than 94 feet. . (16pts) Raw daily oxygen purities delivered by an air products supplier have a normal distribution v a. Approximate the probability that the mean of 16 delivered purities fall within 005 (per standard deviation of 0.1 (percent).

Explanation / Answer

2)

Mean = 100

SD = 10

n = 9

P(X > 94)

z = (94 - 100)/10/9

z = - 1.8

P(z > - 1.8) = 0.9641

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