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Posted by **Kathryn** on Tuesday, October 4, 2011 at 6:12pm.

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What % of the examinees would be expected to get a score of 65 or >?

- statistics -
**drwls**, Tuesday, October 4, 2011 at 8:44pmThe mean is p*N = 50

where p is the probability of getting gthe correct answqer by guessing at random. N is the number of tosses

The variance is p(1 -p)N = 25

The standard deviation is

ó = sqrt25 = 5.

Use a normal ditributuion curve for the probability of getting a score of 65 or better. You are talking 3 sigma from the mean.

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