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The probability that a randomly selected student scored between 70 and 84 is 0.8351
Probability
Probability is simply how likely something is to happen.
Whenever we’re unsure about the outcome of an event, we can talk about the probabilities of certain outcomes—how likely they are. The analysis of events governed by probability is called statistics.
given that:
mean = 80
standard deviation = 4
now we need to find the probability of students scored between 70 and 84
P(70<X<84) = P(X<84) - P(X>70)
= P(Z<(84-80)/4)-P(Z>(70-80)/4)
=P(Z<1) - P(Z>-2.5)
= 0.8413-0.0062
= 0.8351
the probability that a randomly selected student scored between 70 and 84 is 0.8351
To learn more about mean:
https://brainly.com/question/14127076
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