Question

question 5 of 5
a teacher divides her class into groups and assigns each group the task of measuring the mass of the same object three times. the teacher already knows that the mass of the object is 25 g.
based on the results each group records, which group makes the most precise measurements of the object?
a. group a: 28.5 g, 28.4 g, 28.5 g
b. group b: 25.5 g, 25.0 g, 24.8 g
c. group c: 32.1 g, 35.0 g, 25.0 g
d. group d: 20.0 g, 25.0 g, 30.0 g

Explanation:

Step1: Recall precision concept

Precision refers to how close the measured values are to each other.

Step2: Analyze Group A

Values are 28.5 g, 28.4 g, 28.5 g. Differences between values are small.

Step3: Analyze Group B

Values are 25.5 g, 25.0 g, 24.8 g. Differences are a bit larger than A.

Step4: Analyze Group C

Values are 32.1 g, 35.0 g, 25.0 g. Large differences among values.

Step5: Analyze Group D

Values are 20.0 g, 25.0 g, 30.0 g. Large differences among values.

Answer:

A. Group A: 28.5 g, 28.4 g, 28.5 g