Friday

July 25, 2014

July 25, 2014

Posted by **Alexa** on Sunday, March 10, 2013 at 3:38pm.

- Statistics -
**Dr. Jane**, Sunday, March 10, 2013 at 6:40pmI am reading your question as 65 with a standard deviation of 13. This is a population, we will use z-scores and the normal table.

Below 60

(60 -65)/13 = z-score

You can then use the z-table(normal table) to find the area under the lower tail and this will give you the probability of a score under 60

Between 65 and 70

You have to find both z-scores:

(65-65)/13 = 0 that will be right in the middle of the normal table.

(70-65)/13 = z.

using the table, you have to find the area between 65 and 70.

Since there are different versions of z-tables (depending on the textbook), I can't give you further directions regarding reading your z-table.

**Related Questions**

statistics - Suppose that the population standard deviation (ó) for a normally ...

maths - Suppose scores on an IQ test are normally distributed.If the test has ...

Math - Suppose scores on an IQ test are normally distributed. If the test has a...

Math - Suppose scores on an IQ test are normally distributed. If the test has a ...

statistics - The Intelligence Quotient (IQ) test scores are normally distributed...

Statistics - Suppose that two different tests A and B are to be given to a ...

statistics - The Intelligence Quotient (IQ) test scores for adults are normally ...

Word Problem - A math teacher gives two different tests to measure students' ...

statistics - LSAT test scores are normally distributed with a mean of 490 and a ...

statistics - LSAT test scores are normally distributed with a mean of 510 and a ...