SOLUTION: Please help me solve this the distribution of the number of erros 10 students made on a typing test is shown. Errors Frequency 0-2 1 3-5 3 6-8 4 9-11

Question 892769: Please help me solve this the distribution of the number of erros 10 students made on a typing test is shown.
Errors Frequency
0-2 1
3-5 3
6-8 4
9-11 1
12-14 1
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Please help me solve this the distribution of the number of erros 10 students made on a typing test is shown.
Errors Frequency
0-2 1
3-5 3
6-8 4
9-11 1
12-14 1
-----
I'll work out the mean. You can work out the standard deviation.
Note:: Use the mark of each interval to represent the interval value.
-----
mean = (1*1 + 3*4 + 4*7 + 1*10 + 1*13)/(1+3+4+1+1)
-----
= (1 + 12 + 28 + 10 + 13)/(10)
----
= 64/10
===
= 6.4
--------
Note:: The answer you should get for the sample standard deviation is 3.41
=====================
Cheers,
Stan H.
------------------
RELATED QUESTIONS
Can someone please put me on the right track i ask this question four time and no answer... (answered by richwmiller,dylantc77)

You are given the following frequency distribution for the number of errors that... (answered by stanbon)

You are given the following frequency distribution for the number of errors that students (answered by stanbon)

3)Miss jones, the senior typist,made errors on 15 out of 125 pagesof typing,... (answered by Boreal)

Ineed help solving this word problem. on a math test, 12 students earned an A. This... (answered by jainenderkapoor)

please help me solve this question: If 13 out of 30 students failed a math test. What is (answered by richwmiller)

The mean number of typing in a certain newspaper was found to be four per page. Find the... (answered by ikleyn)

A newspaper is known to have a mean number of 4 typing errors per page. Find the... (answered by Boreal)

Please help me solve this: Six students averaged 90% on a class test. Four other... (answered by Alan3354)