Question

The distribution of images on the pages of a 350-page catalog is found to follow normal distribution with a mean of 32 images per page and a standard deviation of 8 images per page. Which conclusion does this information best support? Approximately 238 pages fall within the first standard deviation of the mean. Approximately 238 pages fall within the second standard deviation of the mean. Approximately 238 pages fall within the third standard deviation of the mean. Approximately 346 pages fall within the second standard deviation of the mean. Approximately 332 pages fall within the third standard deviation of the mean. NextReset

Answer 1

Approximately 238 pages fall within the second standard deviation of the mean. The 68-95-99.7 rule gives that in a normal distribution, about 68% of the data fall within the first standard deviation, and 350*0.68=238. 350*0.95=332, so about 332 pages fall within the second standard deviation, and 350*99=348.95 pages fall within the third standard deviation.