Algebra

Probability

Medium

applied

What is the mean of the numbers obtained on throwing a die having written 1 on three faces, 2 on two faces and 5 on 1 face?

✅ Correct Option: 1

The die has:

Number 1 on 3 faces
Number 2 on 2 faces
Number 5 on 1 face

Total faces = 3 + 2 + 1 = 6

All the numbers on the 6 faces are:

1, 1, 1, 2, 2, 5

Sum of all numbers:

$1 + 1 + 1 + 2 + 2 + 5 = 12$

Mean = $\dfrac{\text{Sum of all numbers}}{\text{Total number of faces}}$

Mean = $\dfrac{12}{6}$

Mean = $2$

Therefore, the mean of the numbers obtained on throwing the die is $2$ .

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What is the mean of the numbers obtained on throwing a die having written 1 on three faces, 2 on two faces and 5 on 1 face?

Solution

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