Question

lilana wants to start a seventh - grade computer club at hamden middle school. she surveyed 20 seventh - grade students at the town park. she asked each student how many hours they spend on their computers each week. she obtained the following results.
8, 15, 0, 11, 12, 13, 16, 13, 0, 4, 17, 14, 30, 13, 5, 12, 1, 13, 12, 21
what is the ratio of the total number of students who used their computers to the total number of students surveyed?
o $\frac{2}{20}$ or $\frac{1}{10}$
o $\frac{2}{10}$ or $\frac{1}{5}$
o $\frac{18}{20}$ or $\frac{9}{10}$
o $\frac{15}{20}$ or $\frac{3}{4}$

Explanation:

Step1: Count non - zero values

Count the number of students who used their computers (non - zero values in the data set). The data set is 8, 15, 0, 11, 12, 13, 16, 13, 0, 4, 17, 14, 30, 13, 5, 12, 1, 13, 12, 21. The number of non - zero values is 18.

Step2: Identify total surveyed students

The total number of students surveyed is 20.

Step3: Calculate the ratio

The ratio of the total number of students who used their computers to the total number of students surveyed is $\frac{18}{20}=\frac{9}{10}$.

Answer:

C. $\frac{18}{20}$ or $\frac{9}{10}$