The scores on a psychology exam were normally distributed with a mean of 57 and a standard deviation of 9. a failing grade on the exam was anything 2 or more standard deviations below the mean. what was the cutoff for a failing score? approximately what percentage of the students failed?

The cutoff for a failing score is with of the students failed.

Following the general formula,

According to the question, the scores on a psychology exam were normally distributed with a mean of 57 and a standard deviation of 9. A failing grade on the exam was anything 2 or more standard deviations below the mean so,

Also, falling cut-off score is calculated as-

Hence, cutoff for a failing score is with of the students failed.

Learn more about mean and standard deviation here:

link

0

step-by-step explanation:

you can not divide by 0 so 4 ÷ 0 would be 0

0 × 9999 =0

mark brainliest   : )

choice b is correct

step-by-step explanation:

we have been given the following system of inequalities;

we are required to graph the solution to the system of inequalities. using a graphing tool, the graph of the system is as shown in the attachment. the continuous line represents the graph of while the dotted line represents .