(Solved): The average full-sized front-toading Energy Star clothes washer uses 15 gallons of water per load. ...

The average full-sized front-toading Energy Star clothes washer uses 15 gallons of water per load. Assume that the populaton standard deviation for the number of gallons of water used to wash a load by these machines is 3 What is the probability that a random sample of 50 loads washed in a full-sized front-loading Energy Star clothes washer will result in a sample mean gallons of water usage that is no more than 15.75 ? Choose the closest answer. $\begin{array}{l}177\\ 0.0384\\ 0.9616\\ 0.9011\end{array}$