Assume that 75 was the mean test score on an exam, with a standard deviation of 4 points.

Mathematics

1 answer:

Tems11 [23]2 years ago

5 0

Answer:

68%

Step-by-step explanation:

The Empirical Rule states that, for a normally distributed random variable:

Approximately 68% of the measures are within 1 standard deviation of the mean.

Approximately 95% of the measures are within 2 standard deviations of the mean.

Approximately 99.7% of the measures are within 3 standard deviations of the mean.

In this problem, we have that:

Mean of 75, standard deviation of 4.

What percent had scores between 67 and 75?

67 = 71 - 4

75 = 71 + 4

Within 1 standard deviation of the mean, so, by the Empirical Rule, 68%.

You might be interested in

Which of the following is not a property of mathematical proofs?

Contact [7]

There are no properties of mathematical proofs
on the list of choices that you have offered.

7 0

3 years ago

Which pair of angles are corresponding angles

Arte-miy333 [17]

Answer is C
<3 and <7
-----------

3 0

3 years ago

Read 2 more answers

We have 4different boxesand 6different objects. We want to distribute the objects into the boxes such that at no box is empty. I

Musya8 [376]

Answer:

Following are the solution to this question:

Step-by-step explanation:

They provide various boxes or various objects. It also wants objects to be distributed into containers, so no container is empty. All we select k objects of r to keep no boxes empty, which (r C k) could be done. All such k artifacts can be placed in k containers, each of them in k! Forms. There will be remaining $(r-k)$ objects. All can be put in any of k boxes. Therefore, these $(r-k)$ objects could in the $k^{(r-k)}$ manner are organized. Consequently, both possible ways to do this are