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
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-> 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
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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
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.
