Help with part (d) finding the standard deviation

Suppose the following data represent the ratings (on a scale from 1 to 5) for a certain smart phone game, with 1 representing a poor rating. Complete parts (a) through (d) below. Stars Frequency Er 1 2381 2 2824 3 4520 4 3813 5 11,665 0.5. o.5-. o.5-. 0.4- 0,4. M. 0.3- 9' 0.3- 9' 0.3- 0' 0,2 0.2- 0.2- @ @ @ o o 0- 12345 12345 12345 12345 (c) Compute and interpret the mean of the random variable x. The mean is 3.8 stars. (Round to one decimal plaoe as needed.) Which of the following interpretations of the mean is correct? . The observed value of an experiment will be less than the mean of the random variable in most experiments. . As the number of experiments increases, the mean of the observations will approach the mean of the random variable. . The obsen/ed value of an experiment will be equal to the mean of the random variable in most experiments. . As the number of experiments decreases, the mean of the observations will approach the mean of the random variable. (d) Compute the standard deviation of the random variable x. The standard deviation is U stars. (Round to one decimal plaoe as needed.)