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Subhashree
Subject: Maths
, asked on 2/3/18
X^2 + x/4 - 1/8
Answer
1
Souhardya Mazumdar
Subject: Maths
, asked on 2/3/18
$2Ifthemeanof{x}_{1},{x}_{2}.......{x}_{n}is\overline{)x}thenproof,\phantom{\rule{0ex}{0ex}}\sum _{i=1}^{n}{\left({x}_{i}-\overline{)x}\right)}^{2}=\sum _{i=1}^{n}{{x}_{i}}^{2}-n\overline{)x}{}^{2}$
Answer
1
Naga Nandhini
Subject: Maths
, asked on 20/2/18
Find the mean,variance and standard deviation
C.I. 0-10 10-20 20-30 30-40 40-50 50-60 60-70 70-80 80-90 90-100
Freq 18 16 8 15 12 10 15 2 3 1
Answer
1
Naga Nandhini
Subject: Maths
, asked on 8/2/18
Answer this please!
Calculate mean, Variance and standard deviation for the following distribution
Classes: 30-40 40-50 50-60 60-70 70-80 80-90 90-100
Frequency: 3 7 12 15 8 3 2
Answer
1
Naga Nandhini
Subject: Maths
, asked on 7/2/18
Calculate mean,variance,standard deviation for the following distribution
Classes- 30-40 40-50 50-60 60-70 70-80 80-90 90-100
frequency 3 7 12 15 8 3 2
Answer
1
Shreyans Singh
Subject: Maths
, asked on 1/2/18
Solve this:
Answer
1
Dharunika Vijayakumar
Subject: Maths
, asked on 28/1/18
tell me the answer for the 11th question.
please answer me quickly
Q.11. The marks obtained by 7 students are 8, 9,11, 13, 14, 15, 21. Find the variance and standard deviation of these marks.
Answer
1
Hermoine
Subject: Maths
, asked on 29/12/17
Pls solve my query
Can anyone explain how these formulae are same????
Answer
1
Varun Gupta
Subject: Maths
, asked on 13/12/17
If the variance of the scores a, 4, 6, b and 10 is 8, then the possible values of a and b are:
a. 2 and 8
b. 3 and 5
c. 4 and 5
d. 2 and 4
Answer
1
Ruba Balu
Subject: Maths
, asked on 12/11/17
9th
9. The variance of 20 observations is 5. If each observation is multiplied by 2, then find the variance of the resulting observations.
Answer
1
Ruba Balu
Subject: Maths
, asked on 12/11/17
7th. send ans with explanation. plss no links.
Q.7. The variance of 15 observations is 6. If each observation is increased by 8; find the variance of the resulting observations.
Answer
1
Ramandeep
Subject: Maths
, asked on 6/9/17
ncert solutions of ch 15 by step deviation
Answer
1
S.chandhana
Subject: Maths
, asked on 9/8/17
evaluate the following numbers: 5,6,4,6,8,4,2,8,6,5
Evaluate: (i)the mean (ii)the median (iii)the mode (iv)the range (v)the standard deviation
Answer
1
Ghumesh Ladha
Subject: Maths
, asked on 1/5/17
Examples of less than cumulative frequency
Answer
1
Amiya Nath Sharma
Subject: Maths
, asked on 16/3/17
variance and standard deviation of 8,12,13,15,22,14
Answer
1
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What are you looking for?

C.I. 0-10 10-20 20-30 30-40 40-50 50-60 60-70 70-80 80-90 90-100

Freq 18 16 8 15 12 10 15 2 3 1

Calculate mean, Variance and standard deviation for the following distribution

Classes: 30-40 40-50 50-60 60-70 70-80 80-90 90-100

Frequency: 3 7 12 15 8 3 2

Classes- 30-40 40-50 50-60 60-70 70-80 80-90 90-100

frequency 3 7 12 15 8 3 2

please answer me quickly

Q.11. The marks obtained by 7 students are 8, 9,11, 13, 14, 15, 21. Find the variance and standard deviation of these marks.

Can anyone explain how these formulae are same????

a. 2 and 8

b. 3 and 5

c. 4 and 5

d. 2 and 4

9. The variance of 20 observations is 5. If each observation is multiplied by 2, then find the variance of the resulting observations.

Q.7. The variance of 15 observations is 6. If each observation is increased by 8; find the variance of the resulting observations.

Evaluate: (i)the mean (ii)the median (iii)the mode (iv)the range (v)the standard deviation