The histogram shows the reviewer ratings on a scale from 1 (lowest) to 5 (highest) of a recently published book.

(a) Find the mean, variance, and standard deviation of the probability distribution.

(b) Interpret the results.

Reviewer Ratings 1 2 3 4 5 0.0 0.1 0.2 0.3 0.4 0.5

Rating Probability 0.020 0.097 0.213 0.236 0.434

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