請問一下統計題目(代PO~)~謝謝~!!!

今天我阿姨丟給我一份統計題目~說是他的作業~可是我是理工科的沒辦法幫他忙~所以我想麻煩各位一下~謝謝~!!!1.A random sample of size 100were selected from a population with mean 10 and variance 9.Find the mean and standard deviation of the sampling distribution of the sample mean and also find the probability that sample mean is less than 10.2 ???2. A survey was taken of 313 children

ages 14 to 22 years

from among the childrenof the nation top execcutives.When asked to identify the best aspect of being are ofthis privileged group

55% mentioned material and financial advantages.Suppose that theproportion P of children in the porulation is actually cqual to 0.5 What is the probability of observing a sample proporion as large as or larger than the observed P=0.55???3. Twelve neasurements were randomly selected from a normal population with mean and standard deviation

125.12 and 12.3

respectively.fond P(X