From NOVA

[sruthi07]

can anyone expl Q 4 on Page 282? I didnt get the expln the book gives....
thnx

[rocky80]

if its not DI than can u post the question here?

[addict]

If possible, please post the question.

[sruthi07]

if x<y<z , z=ky, x=0 and the average of x, y and z= 3times the median, what is the value of k?

-2, 3, 5.5, 6, 8

( i got the q after i posted, anywys!)

[rocky80]

median = (n+1)/2 th term

so in this case its Y

now,
(y+z) /3 =3 y

z = 8 y = 8k

k = 8

[sruthi07]

why + 1 in the equation?

median = (n+1)/2 th term

so in this case its Y

now,
(y+z) /3 =3 y

z = 8 y = 8k

k = 8

[rocky80]

thats the formula of median....

[addict]

you can think of median like this:
>> arrange the numbers in ascending or descending order
>> If there are odd no. of numbers then the number in the middle is the median
>> but if there are even no. of numbers, then the average of the two middle numbers is the median. e.g; The median of 1, 2,3,4,5,6 is (3+4)/2=3.5

[rocky80]

see addict dont get confued the formula for median is always (n+1) / 2

when nos. are odd this comes to middle term

when nos. are even say 6 this becomes 6+1 /2 = 7/2 = 3.5th term that means mean of 3rd and 4th term .

got me buddy!!

[gre_girl]

hi rocky80,
i think u r right
regards