Natasha Awada, Paul La Rondie, Laurie Buchanan and, Jill Stevens Solutions for Chapter: Representing Data: Statistics for Univariate Data, Exercise 19: Exercise 6D

The bar chart shows the number of children per family in a selection of families.

Find the mean number of children per family, to the nearest tenth.

The histogram represents the ages of the people in a village.

How many people are there in the village?.

The histogram represents the ages of the people in a village.

The modal class of the distribution is given by $a<x\le b$, then find $a$.

The histogram represents the ages of the people in a village.

Find the mean age.(Answer upto two decimals).

If the mode of this set of numbers is $2$ and the mean is $5$ , find the sum of the values of $a$ and $b$.

$1,2, a, 4,5,6, b, 8,10$

The mean of $8, x, 17,2 x+3$ and $45$ is $23$ . Find the value of $x$.

The mean of $8, \mathrm{x}, 17,2 \mathrm{x}+3 \mathrm{and} 45 \mathrm{is} 23$. Find the value of $x$.

In an IB class, there are $8$ boys and $12$ girls. The mean mass of the boys is $52 \mathrm{kg}$ and the mean mass of the girls is $44 \mathrm{kg}$. What is the mean mass of the whole class of $20$ students?