Question

One type of IQ test fits a normal distribution with a mean of 100 and a standard deviation of 16. c. From a group of 10,000 people, how many would you expect to have IQs above 140?
When I found the z score, I got 2.5. When I looked on the z chart, I saw that the percentge was .62%
Now, how do I find how many people out of 10, 000 will have an IQ over 140?

Answer 1

what tools do you have to determine a cumulative density?

Answer 2

i see yo have a ztable

Answer 3

assuming the \(.62\%\) is right, then your job is only to compute \(.0062\times 10,000\) i think

Answer 4

62 people??

Answer 5

your .62 is not correct

Answer 6

but @amistre64 probably knows better than i
i think z score chart gives the percent above the z score, but i could be wrong

Answer 7

the ztable are author dependant; some are from the mean, others are tailed

Answer 8

...huh?XD