Question

lucy randomly surveyed 25 students in her school about the number of bottles of water they consumed in the last week. she recorded the results in the bar graph shown below. there are 236 students in lucys school. based on her graph, how many of the 236 students should lucy expect to have consumed either 0 bottles or 1 bottle of water last week?

Explanation:

Step1: Find number of surveyed students who consumed 0 or 1 bottle

Add the number of students who consumed 0 bottles and 1 bottle in the survey. $11 + 5=16$

Step2: Set up proportion

Let $x$ be the number of students in the whole - school who consumed 0 or 1 bottle. The proportion is $\frac{16}{25}=\frac{x}{236}$

Step3: Solve for $x$

Cross - multiply: $25x = 16\times236$. Then $x=\frac{16\times236}{25}=\frac{3776}{25}=151.04\approx151$

Answer:

151