Question

dult IQ scores have a bell-shaped distribution with a mean of 100 and a standard deviation of 15. Use the Empirical Rule to find the percentage of adults with scores between 70 and 130.
1) 99.7%
2) 68%
3) 100%
4) 95%

Answer 1

95%

Answer 2

whats the rational behind 95% ?

Answer 3

its 95%

Answer 4

Lol

Answer 5

simply stating an answer of 95% has no study value in it whatsoever. Please do not just provide an answer without backing it up with some sort of reasoning, otherwise all the site becomes is a free answering service.

Answer 6

i understand .

Answer 7

:)

Answer 8

70 is 2 standard deviations less than the mean and 130 is 2 SD more than it.
\[pr( \mu - 2\sigma \le x \le \mu + 2\sigma )= 0.9545\]