Mathematics, 22.10.2019 03:50, james234886

The overhead reach distances of adult females are normally distributed with a mean of 197.5 cm and a standard deviation of 8.6 cm.
a. find the probability that an individual distance is greater than 206.80 cm.
b. find the probability that the mean for 15 randomly selected distances is greater than 196.20 cm.
c. why can the normal distribution be used in part (b), even though the sample size does not exceed 30?

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