Please answer correctly

Suppose a team of pedestrians takes a simple random sample of 100 babies. in this sample, the babies have a head circumference of 46.35 cm and a standard deviation of 1.1 cm. what percent of the time would a random sample of 100 babies a sample mean that is not in the 90% confidence interval? a) 0% b)2.5% c)5% d)10%

If it takes two men an hour to unload a truck full of merchandise, how long will it take six men to do the same amount of work? 1 hour, 45 mins, 20 mins, or 30 mins?

Solve by elimination. x + y =4 3x + 3y =12