Question

A phone company tested the battery life of a random sample of 20 of its newest model phones. The dot plot shows the company's results.

Based on the sample, predict the mean battery life of the company's newest model of phone.
Enter the correct answer in the box.

Round to the nearest tenth of an hour.

Answer 1

`\orange \hookrightarrow \red { \rm \: mean = (sum \: of \: observations)/(total \: observations) }`

• Total observations = 20

`\orange \hookrightarrow \red { \rm \: mean = (14 ×2+14.1×1 +14.2×3+ 14.3×3 + 14.4×2 + 14.5×3+14.6×3+14.7×2+14.8+14.9+15)/(20) }`

Add all the numbers in numerator

`\orange \hookrightarrow \red { \rm \: mean = (317.81)/(20) }`

`\orange\hookrightarrow \red { \rm \: mean = 15.8 \: hours}`