Question

The scores on a mathematics exam have a mean of 69 and a standard deviation of 6. Find the x-value that corresponds to the z-score 1.28.

Question 6 answers
a.70.3
b.75.0
c.61.3
d.76.7

Answer 1

The x-value that corresponds to the z-score 1.28 is approximately 76.68.

Step-by-step explanation:

To find the x-value that corresponds to the z-score 1.28, we can use the formula:

x = z * standard deviation + mean

Given that the mean is 69 and the standard deviation is 6, we substitute these values into the formula and solve for x:

x = 1.28 * 6 + 69 = 76.68

Therefore, the x-value that corresponds to a z-score of 1.28 is approximately 76.68.