Get 2 FREE Instant-Explanations on Filo with code FILOAPP

Find the standard deviation for the following data :

Question

Find the standard deviation for the following data :

Views: 898 students

Found 5 tutors discussing this question

Oliver Discussed

8 mins ago

Discuss this question LIVE

8 mins ago

Text solutionVerified

Solution: In the given data,

f_{i} x_{i} = 21, 80, 195, 180, 138

f_{i} x_{i}^{2} = 63, 640, 2535, 3240, 3174

Now, standard deviation is given by,

σ = \frac{1}{N} N \sum f_{i} x_{i}^{2} - (\sum f_{i} x_{i})^{2}

Here,

N = \sum f_{i} = 48

\sum f_{i} x_{i} = 614

\sum f_{i} x_{i}^{2} = 9652

So, putting these values,

σ = \frac{1}{48} 48 (9652) - 614^{2}

\Rightarrow σ = \frac{1}{48} 463296 - 376998

\Rightarrow σ = \frac{1}{48} 86300 = \frac{293.76}{48}

\Rightarrow σ = 6.12

Was this solution helpful?

150

Report

One destination to cover all your homework and assignment needs

Learn Practice Revision Succeed

Instant 1:1 help, 24x7

60, 000+ Expert tutors

Textbook solutions

Big idea maths, McGraw-Hill Education etc

Essay review

Get expert feedback on your essay

Schedule classes

High dosage tutoring from Dedicated 3 experts

Trusted by 4 million+ students

Stuck on the question or explanation?

Connect with our math tutors online and get step by step solution of this question.

231 students are taking LIVE classes

Question Text	Find the standard deviation for the following data :
Answer Type	Text solution:1
Upvotes	150