Question

Jane writes numbers on 4 cards.
The number has rubbed off the last card, but she knows that the mean of the numbers is 15
13 22 11
What number was on the 4th card?

Answer 1

The number would be 14

Answer 2

The number on 4th card is 14.

What is Mean?

The mean of a dataset is the sum of all values divided by the total number of values. It's the most commonly used measure of central tendency and is often referred to as the “average.”

Here, Let the 4th number be x

         mean = 15

         Given numbers on cards are { 13, 22, 11, x}

      Mean = Sum of all numbers / Number of terms

      15 = (13 + 22 + 11 + x ) / 4

      60 = 46 + x

      x = 14

Thus, the number on 4th card is 14.

Learn more about Mean from:

https://brainly.com/question/10211620

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