Answer:
3000
Step-by-step explanation:
This states that a number divided by 3 is 21. the equation is: n/3 = 21
if the mean is 70 minutes, then 90 minutes is 2 standard deviations above 70. if you look at the bell curve i drew, the percent of exams that took over 90 minutes is 2.5%
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Answer:2
Step-by-step explanation:
