Normal distribution has mean µ=200 and a standard deviation σ = 50. Sample of n = 64 were selected. What is the probability that the sample mean will be between 180 and 230? ........ Tip: Apply formula S = σ/√n to find standard deviation of sample mean, use this standard deviation to convert 180 and 230 to z-score and then use Appendix Table for Normal distribution.
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