Question:

Suppose that left arm lengths (in cm) of the Dalhousie student population isfound to be normally distributed with a mean of 69 cm. and standard deviationof 8 cm. If this population is subjected to repeated random sampling with replacement,and with a constant sample size of 10:

a.What is the probability that the mean of a randomly selected sample is lessthan or equal to 63 cm. (Give decimal answer to three places past the decimal.)