The number on 4th card is 14.
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.
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