Question

The number of years before a Sunshine CD player breaks down is normally distributed with a mean of 4.1 years and a standard deviation of 1.3 years.



Part A

Which of the graphs below represents the situation?

A


B


C


D

Answer 1

I can’t see the four graphs — could you either upload them or describe how the x‑axis is labeled on each?

If you want to pick the correct graph yourself, use these checks:

- The normal curve’s peak (center) must be at the mean 4.1. So the highest point should be located at x = 4.1.
- The inflection points (where the curve changes from concave down to concave up) occur at mean ± 1 SD, i.e. at 4.1 ± 1.3 → 2.8 and 5.4. So the “shoulders” of the bell should be at about 2.8 and 5.4.
- The curve should be symmetric about 4.1.

If you tell me what each option shows (where the peak is, or the x‑tick labels), I’ll pick A/B/C/D for you.