1.In how many ways can a committee of 4 men and 6 women be chosen from a group of 18 people, of which 7 are men and 11 are women?

No of ways= ______

a)In a recent study 70 percent of homes in Canada were found to have computers. In a sample of 9 homes, what is the probability that 6 have computers?

Enter your answer as a decimal.

For full marks your answer should be accurate to at least three decimal places.

P(X=6)= _____

b)A population standard deviation is estimated to be 13. We want to estimate the population mean within 1.9, with a 90-percent level of confidence. What sample size is required? For full marks round your answerupto the next whole number

Sample size= _______