Help with Stats & Prob?
a) Let Y be a population with variance 25 and mean 75. Find the probability that in a random sample of 64 the sample mean will be between 74 and 77.
b) Find the probability that the sample standard deviation will be between 4.5 and 6 assuming Y is a normal population
- Julius NLv 77 years agoFavorite Answer
a) z = ( x - μ ) / (σ÷√η)
P (74 < x < 77) = P (-1.6 < z < 3.2) = 0.9445