11,12,13

11. Suppose that a poll taken 10 years ago found that 75% of parents spank their children, Suppose a recent poll of 400 adults with children finds that 190 indicated that they spank their children, Complete parts (a) and (b) below. Assuming parents' attitude toward spanking has not changed since the original poll, how many of the 400 parents surveyed would be expected to spank their children? 12 Sociologists say that 90% of married women claim that their husband's mother is the biggest bone of contention in their marriages (sex and money are lower-rated areas of contention). Suppose that eight married women are having coffee together one morning. Find the following probabilities. (Round your answers to three decimal places.) All of them dislike their mother-in-law n=8, p = 90%=0.9, x=8 P(X=8) = BINOMPDF(8,0.9,8) b. None of them dislike their mother-in-law C. At least six of them dislike their mother-in-law d. No more than five of them dislike their mother-in-law. e. Find the mean and standard deviation 13. Trevor is interested in purchasing the local hardware/sporting goods store in the small town of Dove Creek, Montana. After examining accounting records for the past several years, he found that the store has been grossing over $850 per day about 65% of the business days it is open. Estimate the probability that the store will gross over $850 for the following. (Round your answers to three decimal places.) a. At least 3 out of 5 business days At least 6 out of 10 business days C. Fewer than 5 out of 10 business days d. Fewer than 6 out of the next 20 business days