On a recent test, students had the following scores: 85, 100, 92, 96, 87, 94, 75. for these scores, find: a) mean b) variance = sum of (difference from the mean)^2 c) standard deviation = square root of the variance

Sam is a waiter at a local restaurant where he earns wages of $5 per hour sam figures that he also eams about $3 in tips for each person he serves sam works 6 hours on a particular day. if n represents the number of people sam serves that day, which of the following functions could sam use to figure ehis total earings for the do o a. en) = 30 o b. en) = 5n+ 18