population frequency

Statistics
Tutor: None Selected Time limit: 1 Day

population of 700

Class

-20 up to -10

-10 up to 0

0 up to 10

10 up to 20

Frequency 

.32

.22

.36

.10

Feb 11th, 2015

What is the question please


Feb 11th, 2015

Sorry....find mean variance standard deviation

Feb 11th, 2015

mean=-2.6

variance=111.6

standard deviation=10.564

Feb 11th, 2015

hey..i have already sent the answers

Feb 11th, 2015

Thank you....can u plz send details on how u got answer

Feb 11th, 2015

class frequency(f)midpoint(x)fxx^2fx^2
 -20-1032-15-4802257200
 -10-022-5-11025550
 0-1036518025900
 10-2010151502252250
 sum of f=100  sum of fx=-260   sum of fx^2=10900

mean =sum of fx/sum of f

=-260/100=-2.6

variance =(sum of fx^2/sum of f)-(sum of fx/sum of f)

=(10900/100)-(-260/100)

=109-(-2.6)

=109+2.6

=111.6

standard variance=square root of variance

standard variance=10.564

Feb 11th, 2015

hey...i have done the work

Feb 11th, 2015

have you seen the work?

Feb 11th, 2015

Yes....will review for my understanding.. I appreciate your help

Feb 11th, 2015

can i please get the payment..?

Feb 11th, 2015

Will send later this evening

Feb 11th, 2015

ok

Feb 11th, 2015

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Feb 11th, 2015
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Feb 11th, 2015
Dec 9th, 2016
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