SOLUTION: The math department at a university gives all of the students in a certain math class the same final exam. The scores are normally distributed with a mean of 80 and a standard devi
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Question 629193: The math department at a university gives all of the students in a certain math class the same final exam. The scores are normally distributed with a mean of 80 and a standard deviation of 10. What percentage of the students is expected to receive a score of 70 or more? Answer by ewatrrr(24785) (Show Source):
Hi,
mean of 80 and a standard deviation of 10
*Note: in this case z = (70-80)/10
P(x ≥ 70) = 1 - P(z = -1) = 1 - NORMSDIST(-1) = 1 - .1587 = .8413 0r 84.13%
Note: One may use a table, calculator or Excel function to find P(z= -1)
