In a survey, the average age of a group of people is 30 years. If one person age
Practice Questions
Q1
In a survey, the average age of a group of people is 30 years. If one person aged 40 leaves the group, what will be the new average age if the group originally had 10 people? (2023)
28
29
30
31
Questions & Step-by-Step Solutions
In a survey, the average age of a group of people is 30 years. If one person aged 40 leaves the group, what will be the new average age if the group originally had 10 people? (2023)
Step 1: Find the total age of the original group. Since the average age is 30 and there are 10 people, multiply 30 by 10. This gives you 300.
Step 2: One person aged 40 leaves the group. Subtract 40 from the total age you found in Step 1. So, 300 - 40 equals 260.
Step 3: Now, the group has 9 people left (10 - 1 = 9).
Step 4: To find the new average age, divide the new total age (260) by the new number of people (9). So, 260 divided by 9 equals approximately 28.89.
Step 5: Round 28.89 to the nearest whole number, which is 29.
