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The overhead reach distance of adult females are normally distributed with a mean of 197.5 cm...

The overhead reach distance of adult females are normally distributed with a mean of 197.5 cm and a standard deviation of 8 cm.
a. find the probability that an indivdual distance is greater than 207.50cm
b. find the probability the mean for 20 randomly selected distances is greater than 195.30cm.
Math   Statistics-And-Probability   
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