Explanation

Explanation

Find the differences:

6 − 2 = 4

12 − 6 = 6

20 − 12 = 8

30 − 20 = 10

42 − 30 = 12

The differences increase by 2 each time.

Next difference = 14

42+14=56

Last updated on 30 Oct 2026

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Explanation

The prime numbers between 60 and 80 are:

61, 67, 71, 73, and 79

Let's add them up:

61 + 67 = 128

128 + 71 = 199

199 + 73 = 272

272 + 79 = 351

Last verified on 02-04-2026

Explanation

To calculate the average (or mean) of a data set, you use the formula:

Average=Sum of all values/Number of values​

Given:

• The sum of all 10 values in the data set is 10.
• The number of values is 10.

Using the formula:

Average=10/10​=1

$$Last\; updated\; on\; 30\; Oct\; 2026$$

Explanation

A percentile rank indicates the percentage of scores in the normative group falling at or below that specific score.

Additional Information:

Percentile Interpretation:  Compares an individual's standing relative to a reference normative population.

Norm-Referenced Scoring:  Clarifies relative performance rather than measuring mastery against an absolute standard.