Stats Help

[black widow]

cud anyone plz answer question 3 of this paper with complete steps
http://papers.xtremepapers.com/CIE/... O Level/Statistics (4040)/4040_w12_qp_22.pdf
i have tried the mean deviation formula but my answer is 3 hours 7 min whereas the answer in the examiner report is 3 hours 8 min
thankx

 

[black widow]

The Following Process Might Help,



Classes ......................... Mid ....................... Frequency ........... Deviation........ fd(F Multiply D)

2 h 50 m  t  3 h 00 m .... 2 h 55 m ....................5 ........................-10 m...................... -50 m
3 h 00 m  t  3 h 10 m .... 3 h 5 m (a) .................14 .........................0 m
3 h 10 m  t  3 h 20 m .... 3 h 15 m .....................7 ..........................10 m......................... 70 m
3 h 20 m  t  3 h 30 m .... 3 h 25 m .....................4.......................... 20 m....................... 80 m



So Sum up fd which = 100
then, Divide by total no of Frequency which is = 30



So on . Results would be 3. 33333333333333333333333333333
Just round to nearest min= 3 m
and then add to the the assumed mean



So you have a answer, 3 h 8 m

Tell me if helps,
Kind Regards ,
Asad

thank alot dude

 

[Asad.Babur]

This is my Original Account

 

[Asad.Babur]

thank alot dude

How old are You?

 

[black widow]

How old are You?

15

 

[B!(+)(+)dy $k(_)!!]

 

[B!(+)(+)dy $k(_)!!]