Question

In a survey, 300 adults and children were asked whether they preferred hamburgers or pizza. The survey data are shown in the relative frequency table.

Answer 1

The percentage of the people surveyed are children is:

40%

Explanation:

We are given a table as follows:

HAMBURGERS PIZZA TOTAL

ADULTS 0.24 0.36 0.6

CHILDREN 0.11 0.29 0.4

TOTAL 0.35 0.65 1

Now we are asked to find the percent of students that were surveyed.

From the table we may see that the probability of children who were surveyed are:

0.11+0.29=0.40

( since, the second column gives the total of the probability of children)

Hence, in percentage form it is given by:

0.40×100=40%

Hence, the answer is:

40%

Answer 2

D. 40%

Explanation:

You can fill in the table completely

`\begin{array}{cccc}&\text{Hamburgers}&\text{Pizza}&\text{Total}\\\text{Adults}&0.24&0.36&0.6\\\text{Children}&0.11&0.29&0.4\\\text{Total}&0.35&0.65&1\end{array}`

From this table you can state that the probability that a randomly selected person is a child is 0.4 that is 40%.