What’s the answer in this problem i’m stuck and can’t go forward

Given the following sampling distribution of one mean with a sample size 49, from a normally distributed population, find the population standard deviation, o.79828588912497

Find the common ratio of the sequence. -4, 8, -16, 32, a: -12b: -2c: 12d: -1/-2

The graph shows how many words per minute two students read. drag to the table the unit rate that matches each graph.