an IQ test is designed so that the mean is 100 and the standard deviation is 10 for the population of adults.

an IQ test is designed so that the mean is 100 and the standard deviation is 10 for the population of adults. find the sample size necessary to estimate the mean IQ score of statistics students such that it can be said with 90% confidence that the sample mean is within 3 IQ points of the true mean. assume σ=10 and determine the require sample size The require sample size is ___