# statistics

posted by .

A set of 50 data values has a mean of 15 and a variance of 36.

Find the standard score of a data value = 30

• statistics -

Use z-scores.

Formula:
z = (x - mean)/sd

x = 30
mean = 15
sd = square root of the variance

I'll let you take it from here.

## Similar Questions

1. ### stats

A set of 50 data values has a mean of 30 and a variance of 4. I. Find the standard score (z) for a data value = 26. II. Find the probability of a data value < 26. I think the first part is z=(26-30)/4 = -4/4 = -1. I am not sure …
2. ### Statistics

A set of 50 data values has a mean of 15 and a variance of 25. Find the standard score of a data value = 20
3. ### Help plz!! Math....

A set of 50 data values has a mean of 15 and a variance of 25. Find the standard score of a data value = 20
4. ### Can someone help me please?

A set of 50 data values has a mean of 15 and a variance of 25. Find the standard score of a data value = 20
5. ### Stats

A set of 50 data values has a mean of 15 and a variance of 36. Find the standard score of a data value = 30
6. ### Statistics

A set of 50 data values has a mean of 35 and a variance of 25. I. Find the standard score (z) for a data value = 26. II. Find the probability of a data value > 26.
7. ### MATH

A set of 50 data values has a mean of 18 and a variance of 4. I. Find the standard score (z) for a data value = 20. II. Find the probability of a data value < 20.
8. ### Statistics

A set of 50 data values has a mean of 27 and a variance of 16. I. Find the standard score (z) for a data value = 19. II. Find the probability of a data value < 19. III. Find the probability of a data value > 19. Show all work.
9. ### Homework Help

A set of 50 data values has a mean of 48 and a variance of 9. I. Find the standard score (z) for a data value = 43. II. Find the probability of a data value < 43.
10. ### statistics

Can you step by srep dumb this down so that I can understand how to get the answer please?

More Similar Questions