11. The formula for the are of a triangle is A = 1/2 bh.
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The variance of a distribution is the square of the standard deviation
The variance of the data is 2.2
<h3>How to calculate the variance</h3>Start by calculating the expected value using:
So, we have:
This gives
Next, calculate E(x^2) using:
So, we have:
The variance is then calculated as:
So, we have:
Approximate
Hence, the variance of the data is 2.2
Read more about variance at:
No. of people don't like to be teacher
= 100% - 75% = 25%
<h3>So, 15 number of students doesn't like to be teacher