Cramer’s Bar and Grille in Dallas can seat 130 people at a time. The manager has been gathering data on the number of minutes a party of four spends in the restaurant from the moment they are seated to when they pay the check. What is the mean number of minutes for a dinner party of four? What is the variance and standard deviation?
Number of MinutesProbability
60………………………………..0.05
70…………………………………0.1
80………………………………..0.20
90………………………………..0.45
100………………………………0.10
110……………………………….0.0