The average of a set of numbers is simply the sum of the numbers divided by the total number of values in the set. For example, suppose we want the average of 24 , 55 , 17 , 87 and 100 . Simply find the sum of the numbers: 24 + 55 + 17 + 87 + 100 = 283 and divide by 5 to get 56.6 .

The mean, or average, is calculated by adding up the scores and dividing the total by the number of scores.

You can find your test score as a percentage by dividing your score by the total number of points, then multiplying by 100.

For the average to be 75, the total no. of marks have to be 450 and the number of tests is 6.

What is the average of the best and the worst score out of 8 tests taken by a student? I. The average of all 8 tests is 84%.

An average test score is the sum of all the scores on an assessment divided by the number of test-takers. For example, if three students took a test and received scores of 69, 87, and 92, these numbers would be added together and then divided by three to get an average of 82.6.

75 is not a horrible grade, it’s an ok grade. You can improve by paying close attention in class and making sure you understand the concepts. Sit in the front of the class if you can.

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100%

7%

87.5%

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80%

A bell curve is a graph depicting the normal distribution, which has a shape reminiscent of a bell. The top of the curve shows the mean, mode, and median of the data collected. Bell curves (normal distributions) are used commonly in statistics, including in analyzing economic and financial data.

Bell curve system of performance appraisal is a forced ranking system imposed on the employees by the management. Through this system, the organization tries to segregate the best, mediocre and worst performers and nurture the best and discard the worst.

Here’s how.

1. Own the system. Know your employer’s annual performance appraisal system thoroughly.
2. Gather the facts.
3. Keep the discussion alive.
4. Work the self-appraisal.
5. Wear the shoes.
6. Expect to be surprised.
7. Bring a solution.
8. Share a goal.

It is important in the field of statistics because they model many real-world data like test results and performance reviews of employees. The bell curve has one mode, and it coincides with the mean and median. For a bell curve, exactly 95% of the data lies within the two standard deviations of the mean.

Look at the symmetrical shape of a bell curve. The center should be where the largest portion of scores would fall. The smallest areas to the far left and right would be where the very lowest and very highest scores would fall. Read across the curve from left to right.

Properties of a normal distribution

1. The mean, mode and median are all equal.
2. The curve is symmetric at the center (i.e. around the mean, μ).
3. Exactly half of the values are to the left of center and exactly half the values are to the right.
4. The total area under the curve is 1.