Question

If u= 70% and o=5%, what % of scores fall within 3 standard deviations from the mean?

Answer 1

Answer:

"85%" is the right answer.

Step-by-step explanation:

Given:

$\mu = 70$ (%)

$\sigma = 5$ (%)

As we know,

The 99.7% observation fall within the 3rd standard deviation, then

⇒ $(\mu \pm \sigma ) = (70-(3\times 5)) \ to \ (70+(3\times 5))$

                $=(70-15) \ to \ (70+15)$

                $=55 \ to \ 85$ (%)

Thus the above is the correct solution.