240 Tomorro SIRI APP YouTube XSCREENT Set WEATHER Locatio MAPS DEST wM STOCKS NASDAQ NYSE 8) The lengths of pregnancies are normally distributed with a mean of 268 days and standard deviation of 15 days. Let RV X represent the length of a pregnancy. Show work including diagrams. a) If samples of size 20 pregnancies is taken, find the mean and standard deviation of the SDSM. b) If a sample of 20 pregnancies is taken, find the probability that the sample mean is less than 262 days.

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