# MATH

posted by .

A mean score on a standardized test is 50 with a standard deviation of 10. Answer the following
a. What scores fall between –1 and +1 standard deviation?
b. What percent of all scores fall between –1 and +1 standard deviation?
c. What score falls at +2 standard deviations?
d. What percentage of scores falls between +1 and +2 standard deviations?

IF THERE IS A FORMULA CAN YOU PROVIDE IT.

• MATH -

Z = (score-mean)/SD

Z = raw scorre interms of standard deviations.

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions related to the Z scores. Insert into equation above.

• MATH -

What percentage of scores falls between +1 and +2 standard deviations?

## Similar Questions

1. ### Stastics

When we convert x-value to z- score and use Standard Normal distribution, which of the following statements is true?
2. ### Statistics

The distribution of scores on a test is mound-shaped and symmetric with a mean score of 78. If 68% of the scores fall between 72 and 84, which of the following is most likely to be the standard deviation of the distribution?
3. ### statistics

a mean score on a standardized test is 50 with a standard deviation of 10. What are the following: 1. what scores fall between -1 and +1 standard deviation?
4. ### statistics

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

The scores of students on standardized test are normally distributed with a mean of 300 and a standard deviation of 40. Between what two values do 99.7% of the test scores lie?
6. ### statistics

A standardized third grade reading test, called the We Can Read Test, has a mean of 50 with a standard deviation of 10. A developmental psychologist conducts a study, where he assesses the reading ability of a random sample of 75 third …
7. ### Statistics

The distribution of IQ scores is a nonstandard normal distribution with a mean of 100 and a standard deviation of 15. What are the value of the mean and standard deviation after all IQ score have been standardized by converting them …
8. ### Foundations of Measurement

Approximately 400,000 students took the GRE in 2009. Observed mean for the Verbal score was 540 with a standard deviation of 80, and the observed mean quantitative score was 500 with a standard deviation of 100. Assuming distribution …
9. ### statistics

1. Suppose you administered an anxiety test to a large sample of people and obtained normally distributed scores with a mean of 45 and a standard deviation of 4. Do not use the web calculator to answer the following questions. Instead, …
10. ### Algebra

I do not understand this homework at all. Any help or elaboration would be greatly appreciated. Thanks. 100 juniors at Southwest High took the SAT test. The scores were distributed normally with a mean of 22 and a standard deviation …

More Similar Questions