Statistics 1 help required

[safdad]

Hey guys im having problem in s1. Its N 09 p62 Q1 (ii). how do u find out estimate for sigma(standard deviation)? how do u guess the probability? can someone help me out?

 

[safdad]

plz anyone?

 

[safdad]

plz i need help here

 

[weesha]

hey as 39 is the lower quartile and63 upper quartile,,
then <39 has probability = 1/4 and < 63 = 3/4
make eqs
p(x<39) = 1/4
and
p(x<63)=3/4
solve them......

 

[safdad]

hey thanx alot

 

[weesha]

u done with its q7 part ii??

 

[Jurol]

hey as 39 is the lower quartile and63 upper quartile,,
then <39 has probability = 1/4 and < 63 = 3/4
make eqs
p(x<39) = 1/4
and
p(x<63)=3/4
solve them......

how do you know that the prob of 39 is 1/4?

 

[deathvalley]

lower quartile = 1/4

 

[Meshuggah]

Ok, I forgot this:
What are the advantages and dis-advantages of Stem & Leaf, Box & Whiskers, Cumulative Graph, Grouped Data, & Raw Data. (Is there sth more?)
Clearly, anyone?