Z = (score-mean)/SD
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability for Z in each of the situations.
on the assumption that IQ's are normally distribited in the population with a mean of 100 and a standard deviation of 20 findbthe proportion of peoples IQ's. what is the probability that a score picked at random will lie above score of 135, lie below score 90, what is the probability of scoring between 90 and 120, lie above score 120
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23
1 answer