Question: According to the College Board http professionals collegeboard com gateway the mean SAT mathema

According to the College Board (, the mean SAT mathematics score for all college-bound seniors was 511 in 2011. Suppose that this is true for the current population of college-bound seniors. Furthermore, assume that 17% of college-bound seniors scored below 410 in this test. Assume that the distribution of SAT mathematics scores for college-bound seniors is approximately normal.
a. Find the standard deviation of the mathematics SAT scores for college-bound seniors.
b. Find the percentage of college-bound seniors whose mathematics SAT scores were above 660.

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