Question

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Answer 1

The answer is 6 schools.

In a box and whisker plot, every piece of whisker or box represents 25% of the whole number of schools.

The schools participated 1 year or less are represented by the left part of the whisker. Which stands for 25%.

To make an equation we need to set 100% = 24 and solve for 25% :
$\frac{25}{100} = \frac{x}{24}$
Set the denominators equal:
$\frac{150}{600} = \frac{25x}{600}$
Remove the denominators and solve:
$150 = 25x \\ \\ x = 6$