1.The time spent commuting from home to work for all employees of a very large company has a normal distribution with a mean of 42 minutes and a standard deviation of 12 minutes. The probability that the mean time spent commuting by a sample of 16 employees of this company will be between 46.26 and 59.35 minutes is

a..0776

b..9222

c..1056

d..8944

2.The value assigned to a population parameter based on the value of a sample statistic is:

3.The single value of a sample statistic that we assign to the population parameter is a:

a.single estimate,

b.mean estimate

c.point estimate

d.singular estimate