Using Measures of Center & Spread To Analyze Data

Estimate the Weight of Water

Formative Assessment

Self Check: Estimate the Weight of Water

Complete this Self Check by yourself.

A school has 10 seventh grade classes, each with 30 students. Lucy wants to find out how well the students can estimate the weight of a gallon of water. She realizes that she cannot survey everyone, but she isn’t sure how to proceed.

  1. How could Lucy go about collecting her data? Lucy decides to start with a random sample of 10 seventh grade students. The students made the following estimates for the weight of a gallon of water (in pounds): 6, 7, 9, 8, 7, 10, 8, 6, 9, 8
  2. Based on this sample, what does a typical seventh grade student at the school think a gallon of water weighs?
  3. How did you reach your conclusion?
  4. Based on the sample, how many seventh grade students at the school think that a gallon of water weighs between 7 and 9 lbs?