Question

Number of observations are 30 and value of arithmetic mean is 15 then sum of all values is 150 450 200 45

Answer 1

Hello Dear!!!

Here's your answer....

Number of observations are 30

Mean is 15

Let,

The sum of observations is x

Mean = Sum of observations/number of observations.

Mean = x/30

15 = x/30

15*30 = x

450 = x

Sum of observations is 450.

___________________________



Hope this helps you....

Answer 2

Sum of all values is 450.

Option (2) is correct.

Given:

• Number of observations are 30 and
• Value of arithmetic mean is 15

To find

• Sum of all values is

1. 150
2. 450
3. 200
4. 45

Solution:

Formula to be used:

• Mean=Sum of all observation/Total number of observation(n)

Step 1:

Write the known values.

Mean = 15

Total number of observation (n)=30

Step 2:

Put values in the formula.

$15 = \frac{ \text{sum \: of \: observations}}{30}$

or

$\text{sum \: of \: observations} = 30 \times 15$

or

$\text{\bf sum \: of \: observations} = 450$

Thus,

Sum of all values/observations is 450.

Option (2) is correct.

Learn more:

1) Mean of 20 observations is 15.5. Later it was found that 24 was misread as 42. Find the correct mean.

https://brainly.in/question/13575596

2) The mean of 45 numbers is 25 if each number is multiplied by 3 find the new mean

https://brainly.in/question/4483889