Question

Intelligence quotients on the Stanford-Binet intelligence test are normally distributed with a mean of 100 and a standard deviation of 16. Use the 68-95-99.7 rule to find the percentage of people with the following IQs:

a.) between 84 and 100

b.) below 52

Answer 1

a) One standard deviation is 16, that is a score of 84. 68 percent will have a score of 100+-16, so 34 percent will have a score from 84 to 100.
b. How many standard deviations is a score of 52?

Answer 2

thank you

The standard devation is the same for b.) as it is for a.)

Answer 3

Yes, of course it is. So how many standard deviations is it to a score of 52?

Answer 4

oh ok so 2.

Answer 5

I meant 3

so would it be

100-16(3) =52
100-99.7=.03

Answer 6

where can I learn the basics of contemporary math? I have a hard time figuring this stuff out

Answer 7

What exactly is contemporary math anyway? How does one define it exactly?