The points obtained by students of a class in a test are normally distributed with a mean of 60 points and a standard deviation of 5 points.


About what percent of students have scored more than 75 points?

0.15

2.5

15.5

34

Respuesta :

Answer:

Option A) is correct.

Step-by-step explanation:

We need to use normalcdf command to find the probability that the variable would fall into a certain interval that we would supply.

As

  • The points obtained by students of a class in a test are normally distributed with a mean of 60 points

and

  • a standard deviation of 5 points

And we have to determine the percent of students have scored more than 75 points.

So,

Mean = μ = 60

Standard Deviation = σ = 5

As we have to determine the percent of students have scored more than 75 points.

Hence,

normalcdf(75,100,60,5) = .0013

Converting on percentage → .0013 × 100 = 0.1

Therefore, option A) is correct as 0.1 percent of students have scored more than 75 points.

Keywords: distribution, mean, median

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