The histogram shows the reviewer ratings on a scale from 1 (lowest) to 5 (highest) of a recently published book. Reviewer Ratings 0.443 (a) Find the mean, variance, and standard deviation of the probability distribution. 0.5- 0.4- (b) Interpret the results. 0.3- 0.219 0.243 Probability 0.2- 0.1- 0.076 0.019 0.0 3 Rating (a) The mean is (Type an integer or a decimal. Do not round.)