Explanation

Average of 10 values = 200

Total sum = Average × Number of values

= 200 × 10

= 2000

Sum of 9 values = 1850

10th value = 2000 − 1850 = 150

Explanation

Given:

• Average weight of 5 persons = 60 kg
• New average of 6 persons = 62 kg

Step 1: Total weight of 5 persons

5 × 60 = 300kg

Step 2: Total weight of 6 persons

6 x 62 = 372kg

$$6 times 62 = 372text{ kg}$$

Step 3: Weight of the new person

$$=\; 372-300$$

=72 kg​

Explanation

Mode = the number that appears most often in the data.

Given data: 40, 45, 45, 50, 60

Count:  

40 appears 1 time  

45 appears 2 times  

50 appears 1 time  

60 appears 1 time  

45 appears the most.

Last verified on 03-09-2026

Explanation

Average of numbers from 1 to 40

For consecutive numbers, average = (First + Last) / 2

= (1 + 40) / 2

= 41 / 2

= 20.5

Last verified on 01-09-2026

Explanation

Average = Sum of all numbers / Total number of numbers

Given numbers: 15, 21, 18

Total number of numbers = 3

Sum = 15 + 21 + 18 = 54

Average = 54 / 3 = 18

Last verified on 24-08-2026