Question

given a mean of 7.6 and a standard deviation of 3.1, what is the z-score value 5 rounded to the nearest tenth? please help ;( the answer choices are 0.8 , 0.3 , -0.3 , -0.8

Answer 1

The z-score formula is \(\Large z = \frac{x - \mu}{\sigma}\)

\(\Large \mu\) is the mean
\(\Large \sigma\) is the standard deviation

\[\Large z = \frac{x - \mu}{\sigma}\]

\[\Large z = \frac{x - 7.6}{3.1}\]

\[\Large z = \frac{5 - 7.6}{3.1}\]

\[\Large z = ???\]

Answer 2

work backwards plug in the numbers in your eqaution.

Answer 3

can you please give me the answer D;

Answer 4

you just need to evaluate \(\Large \frac{5 - 7.6}{3.1}\)