The population of scores on the sat forms a normal distribution with μ =500 and σ = 100. if you take a random sample of n =100 what is the probability that the sample mean will be greater than m = 520

answer:  

\boxed {\frac{1}{5}}  

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solution-

60 *   \frac{1}{5}   = 12

90 * \frac{1}{5} = 18

75 * \frac{1}{5} = 15

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hence, the answer would be \boxed {\frac{1}{5}}