Statistics 250

posted by .

In a normal distribution, what z-score value separates the highest 90% of the scores from the rest of the distribution?
a)z = -1.28
b)z = 1.28
c)z = -0.13
d)z = 0.13

• Statistics 250 -

Look up the Z scores in the back of your stat text labeled something like "areas under the normal distribution." That should give you the answer.

Similar Questions

1. statistics

The distribution of scores on the SAT is approx. normal with mu= 500 and std dev=100. a)what proportion of the population have SAT scores above 650?
2. Statistics

a normal distribution ha am ean of 80 with a standard deviation of 20. what score separates the highest 15% of the distribution from the rest of the score?
3. statistics

A normal distribution has a mean of 20 and a standard deviation of 2. If you convert every score in the distribution to Z scores, which of the following statements would be true of the resulting distribution?
4. statistics

For a normal distribution with a mean of 140 and a standard deviation of 55 find each value requested. a. What is the minimum score needed to be in the bottom 10% of the distribution?
5. statistics

In a normal distribution with the mean being 500 and the standard deviation being 100, what raw score separates the top 40% of a distribution from the rest?
6. statistics

In a normal distribution with the mean being 500 and the standard deviation being 100, what raw score separates the top 40% of a distribution from the rest?
7. statistics

2. Why is it important to know the mean and standard deviation for a data set when applying the empirical rule?
8. Math/Statistics

A statistics teacher believes that the final exam grade for her elementary stats class have a normal distribution with a mean of 82 and a standard deviation on 8. Find the score which separates the top 10% of the scores from the lowest …
9. stats

(a) The test had six multiple-choice items that were scored as correct or incorrect, so the total score was an integer between 0 and 6. Do you think that these data are Normally distributed?
10. Stats

A normal distribution has a mean of 120 and a standard deviation of 20. What score separates the top 40% of the scores from the rest?

More Similar Questions