Scores of iq test have bell-shaped distribution with a mean of 100 and a standard deviation of 18. use the empirical rule to determine the following. a. what percentage of people has an iq score between 46 and 154?
b. what percentage of people has an iq scores less than 82 or greater than 118? c. what percentage is greater than 118?

% of people has an IQ score between and .

% of people has an IQ scores less than or greater than .

% percentage is greater than .

A) Mean

Standard deviation

IQ between and

For

%

B)  

According to the empirical rule, approximately % of a normal distribution falls within one standard deviation of the mean

%%

%

C)

Now, since those with IQ greater than comprise half of the above percentage (due to the distribution's symmetry),  

% % %

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