1. The table below shows the distribution of the ages (in years) of children in a nursery school. Ages (in
1 2 3 45
years
Number of 4 2
35
children
a. Construct a frequency distribution table
b. Find
the modal age
ii.
the mean age
median

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

b

step-by-step explanation:

the word superfluous means unnecessary

answer: the answer is ann