SOLUTION: The scores from an IQ test are normally distributed with mean 100 and standard deviation of 15. Calculate the probability of someone being chosen at random have IQs between : 70

Question 983636: The scores from an IQ test are normally distributed with mean 100 and standard deviation of 15. Calculate the probability of someone being chosen at random have IQs between :
70 to 115
Above 85
Below 85
115 for more

Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
z=(score-100)/15
70 to 115 is the probability of -2 is less than z which is less than 1, or 0.8186. (0,8186 in Europe)
above 85 is z>-1 or 0.8413
Below 85 is the complement of the last or 0.1587 (0,1587 in Europe)
115 or more is the probability of z>1. That is the same as the probability of z<-1, which we just figured. It is also 0.1587.
RELATED QUESTIONS
IQ scores of adults are normally distributed with a mean of 100 and a standard deviation... (answered by stanbon,ewatrrr)

Human IQ scores are approximately normally distributed with the mean 100 and standard... (answered by stanbon)

IQ test scores are normally distributed with a mean of 100 and a standard deviation of 15 (answered by nerdybill)

IQ test scores are normally distributed with a mean of 100 and a standard deviation of... (answered by khwang)

Iq test scores are normally distributed with a mean of 100 and a standard deviation of... (answered by Fombitz)

IQ test scores are normally distributed with a mean of 100 and a standard deviation of... (answered by solver91311)

IQ scores are normally distributed with a mean score of 100 and a standard deviation of... (answered by ewatrrr)

IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. If... (answered by stanbon,edjones)

IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. If... (answered by edjones)