



 
Crystal, If a normal distribution has mean μ and standard deviation σ and you take random samples of size n then the sample means follow a normal distribution with mean μ and standard deviation σ/√n. You have μ = 75, σ = 20 and n = 100 and hence the distribution of sample means is normal with μ = 75 and σ = 20/√100 = 20/10 = 2. Harley  


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