Home
Class 11
MATHS
Let the mean and variance of the frequen...

Let the mean and variance of the frequency distribution
`{:(x:,x_(1)=2,x_(2)=6,x_(3)=8,x_(4)=9),(f:," "4," "4," "alpha," "beta):}`
be 6 and 6.8 respectively. If ` x_(3)` is changed from 8 to 7, then the mean for the new data will be:

A

4

B

5

C

`17/3`

D

`16/3`

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Similar Questions

Explore conceptually related problems

Mode of the following frequency distribution X=4,5,6,7,8;f=6,7,10,8,3

The median for the following frequency distribution is : {:(x_(i) " :",1,2,3,4,5,6,7,8,9),(f_(i)" :",8,10,11,16,20,25,15,9,6):}

If the mean of 6,8,5,7, x and 4 is 7 then find x

The function f(x)=2+4x^(2)+6x^(4)+8x^(6) has

If the mean of the following data is 5.5, then x = {:(x_(i),2,4,6,8),(f_(i)"",3,5,6,x):}

Find the mean of the following distribution: x: 4 6 9 10 15 f: 5 10 10 7 8

Obtain the median for the following frequency distribution: x : 1 2 3 4 5 6 7 8 9 f : 8 10 11 16 20 25 15 9 6

The numbers 4 and 9 have frequencies x and (x - 1) respectively. If their arithmetic mean is 6, then x is equal to :

If the median of the data x_(1), x_(2), x_(3), x_(4), x_(5),x_(6), x_(7), x_(8) " is " alpha and x_(1) lt x_(2) lt x_(3) lt x_(4) lt x_(5) lt x_(6) lt x_(7) lt x_(8) , then the median of x_(3), x_(4), x_(5), x_(6) is