About the data falls within one standard deviation the mean

Solved Step by Step With Explanation- Derma-Roller Lifetime Estimation

Questions

Step 1: Given Information

• You have a random sample of 250 derma-rollers produced by a company.

We want to determine how many derma-rollers will last between 1.5 years and 2.5 years.

To do this, we'll consider the standard deviation.

This percentage is approximately 68% (because it's within one standard deviation from the mean).

Step 4: Calculate the Number of Derma-Rollers