Question

Assume a data set is normally distributed with a mean 171 and standard deviation 20. If the data set contains 550 data values, approximately how many of the data value will fall within the range 141 to 221?

Answer 1

Helpp pssss

Answer 2

i did it this way dunno if im right
550-171 times 20

Answer 3

hmm Thank You but It doesn't give me that as an answer. You mean to get 7580. But the options are 421, 510, 375, 281

Answer 4

oh sorry then :/

Answer 5

ok Thank You anyway