SHOW YOUR ANSWER WITH EXPLINATION . The average commute times for employees of a large company is 22 minutes. The commute time of 12 employees are 20, 33, 27, 35, 18, 29, 40, 22, 18, 55, 13, and 14.
a) Determine the sample mean and the population mean.
b) What is the estimated margin of error of the sample population, using standard deviation?

Aspacecraft can attain a stable orbit 300 kilometers above earth if it reaches a velocity of 7.7 kilometers per second. the formula for a rocket's maximum velocity v in kilometers per second is vequalsminus0.0098tplusc ln upper r, where t is the firing time in seconds, c is the velocity of the exhaust in kilometers per second, and r is the ratio of the mass of the rocket filled with fuel to the mass of the rocket without fuel. find the velocity of a spacecraft whose booster rocket has a mass ratio of 20, an exhaust velocity of 2.1 km/s, and a firing time of 15 s. can the spacecraft achieve a stable orbit 300 km above earth?