The set of data is .
Find the mean:
Add the numbers and then divide by the number of values in the data set.
(Add: )
(Divide: )
The mean is .
Find the variance:
Square the difference between each number and the mean.
Then add the square and divide by the number of values.
(Add: )
. (Divide: )
The variance is .
The standard deviation is the square root of the variance.
.
(Take the square root of the variance)
(Cancel square and root)
. (Use calculator)
The standard deviation is .
The mean is .
The variance is .
The standard deviation is .
"I want to tell you that our students did well on the math exam and showed a marked improvement that, in my estimation, reflected the professional development the faculty received from you. THANK YOU!!!" June Barnett |
"Your site is amazing! It helped me get through Algebra." Charles |
"My daughter uses it to supplement her Algebra 1 school work. She finds it very helpful." Dan Pease |