Question

(a) estimate the proportion of batteries that charged with a temperature of 90 degrees or less. (enter your answer as a decimal between 0 and 1)

Explanation:

Step1: Locate 90 on x - axis

Find the value of 90 on the battery - temperature (x - axis) of the relative cumulative frequency graph.

Step2: Read corresponding y - value

Read the corresponding value on the relative cumulative frequency (y - axis). The relative cumulative frequency at 90 degrees is 0.25.

Answer:

0.25