Let means and standard deviation of 40 o...

Let means and standard deviation of 40 observations are 30 and 5 respectively . If two observations 10 and 12 are found to be wrong and removed then new standard deviation is `sigma` . Find the value of `38 sigma^2`

Text Solution

AI Generated Solution

Topper's Solved these Questions

JEE MAIN 2021
JEE MAINS PREVIOUS YEAR|Exercise Mathematic section B|10 Videos
JEE MAIN 2023
JEE MAINS PREVIOUS YEAR|Exercise Question|435 Videos

Similar Questions

Explore conceptually related problems

The mean and standard deviation of 6 observations are 8 and 4 respectively . If each observation is multiplied by 2, find the new mean and new standard deviation of the resulting observation.

The standard deviation of the observation 5, 5, 5, 5, 5 is

The mean and standard deviation for a,b and 2 are 3 and 1 respectively,then value of ab is

If the men and standards deviation of 100 observations are 50 and 4 respectively.Find the sum of all the observations and the sum of their squares.

The mean and standard deviation of six observations are 8 and 4, respectively.If each observation is multiplied by 3, find the new mean and new standard deviation of the resulting observations.

Mean and standard deviations of 10 observations are 20 and 2 respectively. If p (p ne 0) is multiplied to each observation and then q (q ne 0) is subtracted then new mean and standard deviation becomes half of original value . Then find q

The mean and standard deviation of 20 observations are found to be 10 and 2 respectively. On rechecking, it was found that an observation 8 was incorrect. Find the new standard deviation if wrong item is omitted.

JEE MAINS PREVIOUS YEAR-JEE MAIN 2022-Question

If x^2+y^2+2ax+2by+c=0 is a circle whose diameter is PQ such that absc...
Text Solution
|
Let A=[(a,b),(c,d)] be a matrix such that A=A^-1 where a , b , c ,d in...
Text Solution
|
Let means and standard deviation of 40 observations are 30 and 5 respe...
Text Solution
|
If p and q are two statements then negation of p hArr (q rArr p) is
Text Solution
|
Let a1,a2,a3, . . .,an be in A.P. The ratio of sum of first five terms...
Text Solution
|
Let S be sample space for 5 digit numbers . If p is probability of a n...
Text Solution
|
Let A=[(1,2),(-2,-5)] , alpha & beta belongs to real numbers such that...
Text Solution
|
(p wedge r) hArr (p wedge ~q) which is equivalent to ~p. Then r will b...
Text Solution
|
The remainder of (2021)^(2022)+(2022)^(2021) when divided by 7 is
Text Solution
|
Let R1 and R2 be two relation defined on R by aR1 b:ab ge 0 and aR2b h...
Text Solution
|
If x^2/a^2+y^2/b^2=1 satisfies (4sqrt(2/5),3) and e=1/4 then, a^2+b^2 ...
Text Solution
|
Cos ((2pi)/7) + cos ((4pi)/7) + cos ((6pi)/7) =
Text Solution
|
If lim(x to 7) (18-[1-x])/([x]-3a) exist, then a is equal to
Text Solution
|
abs((14,28,-14),(-14,14,28),(28,-14,14))=abs(adj(adj(A))), then abs(A)...
Text Solution
|
The number of points where tangents are vertical or horizontal to curv...
Text Solution
|
If two curves y=y1(x) and y=y2(x) satisfies differential equation dy/d...
Text Solution
|
Number of all 3xx3 matrices formed by {1,-1,0} such that "Trace"(A A^T...
Text Solution
|
If the coefficient of x^10 in (sqrtx/5^(1/4)+sqrt5/(x^(1/3)))^100 is 5...
Text Solution
|
Let S={z in C:z^2+barz=0}, then sum(zinS) (Re(z)+Im(z)) is equal to
Text Solution
|
The mean and variance of 10 observation are 15 & 15 respectively . If ...
Text Solution
|