madisynk78
02.09.2019 •
Mathematics
The scores of 1000 students on a standardized test are normally distributed with a mean of 50 and a standard deviation of 5. what is the expected number of students who had scores greater than 60
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Ответ:
X is normally distributed with mean 50 and standard deviation 5
We need to find the z-score of 60 students
To find the probability of P(Z>2), we can do 1 - P(Z<2)
So we read the probability when Z<2 which is 0.9772, then subtract from one we get 0.0228
The number of students that has score more than 60 is 0.0228 x 1000 = 228 students
Ответ:
the answer is
Explanation: