Question

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PLSSSS HELP ME!!!


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⚪⚪ NO IRRELEVANT ANSWERS ❌❌

⭕⭕ NO WRONG ANSWERS! DON'T ANSWER IF U R NOT SURE!!

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Answer 1

Answer:

I hope it will help you

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Answer 2

Answer:

51

Step-by-step explanation:

» A.T.Q.

Mean = $\dfrac{ \sum f_{i} x_{i} }{ \sum f_{i}}$ __(1)

Given :

$\sum f_{i} x_{i}$ = 2550

$\sum f_{i}$ = 50

Put value of $\sum f_{i} x_{i}$ and $\sum f_{i}$ in eq. (1)

Mean = $\dfrac{2550}{50}$

=> 51

The method used here to find the value of mean is Direct Mean Method.

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» What is Mean?

Mean is the average of all numbers.

$\implies$ $\dfrac{Sum\:of\: observations}{Number\:of\: observations}$

» Example :

1, 2, 3, 4, 5

Here..

Sum of observations = 1 + 2 + 3 + 4 + 5 = 15

Number of observations = 5

$\implies$ $\dfrac{15}{5}$

$\implies$ $\boxed{3}$

» Types of Mean :

• Direct Method = $\dfrac{ \sum f_{i} x_{i} }{ \sum f_{i}}$

• Assumed Mean Method = a + $\dfrac{ \sum f_{i} d_{i} }{ \sum f_{i}}$

• Step Deviation Method = a + $(\dfrac{ \sum f_{i} u_{i} }{ \sum f_{i}} )$ × h

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