Question

12. Sum of the observations 100. Average is 20. Find the no of observations​

Answer 1

Answer:

5

Step-by-step explanation:

20+20+20+20+20=100

100/5=20

Answer 2

To find : number of observations .

Given : Sum of the observations $100$. Average is $20$.  

Solution :

• As peer given data we know that sum of the observations $100$ and  average is $20$.  
• Average is the arithmetic mean.
• It is the ratio of sum of all the numbers given in data to the total number of observations.
• Formula: $Average =\frac{\text { sum of all the observations }}{\text { total \ no. of observations }}$
• Here, sum of observations $= 100$  
• Average = $20$
• Substituting values in above formula,

        $20 =\frac{100}{number \ of \ observations} \\ \\Number\ of \ observations = \frac{100}{20}$  

                                                 $= 5$

Hence , number of observations is $5$ .