Question

Approximating the standard deviation of a data set given a hist. is a form of cancer. For decades, there was no known treatment. Rather recently, though, doctors surmised that the drug Thalidomide, which lives of those afflicted with multiple myeloma. In was given to pregnant women in the 1950s but was subsequently found to cause birth defects, may extend the li an extensive cinical trial, 20 patients daagnosed as having multiple myeloma were treated with Thalidornide, and the survived was recorded. Suppose that the data are summarized in the following histogram: FreqaencY 10 10 40 20 30 10 Survival time (in months) Based on this histogram, estimate the standard deviation of the sample of 20 survival times Carry your intermediate computations to at least four decimal places, and tound your answer to at least one decimal place (If necessary, consult a list of formulas

Answer 1

Hom the histogtam, we have 2. 0 10 o 20 20-3o 5 o 25 2 135 0 15 90 225 625 0 2 250 625 30-40 2450 35 2. 70 I225 lo,lo0 20 420 Standald deviation 乞f 刉-1 1o,100 -88 20 10.I00 420) 20 20- 8.2l 1280 1g 67-3