Question #346694

A school principal claims that grade 11 students have a mean grade of 86 with a standard deviation of 4. suppose that the distribution is approximately normal. What is the probability that a random selected grade will be less than 84?


1
Expert's answer
2022-06-01T11:46:49-0400
P(X<84)=P(Z<84−864)P(X<84)=P(Z<\dfrac{84-86}{4})

=P(Z<−0.5)≈0.3085=P(Z<-0.5)\approx0.3085


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