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In a survey, the average age of 10 people is 30 years. If one person aged 40 lea
In a survey, the average age of 10 people is 30 years. If one person aged 40 leaves, what will be the new average age?
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In a survey, the average age of 10 people is 30 years. If one person aged 40 leaves, what will be the new average age?
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Total age = 10 * 30 = 300. New total age = 300 - 40 = 260. New average = 260 / 9 = 28.89.
Questions & Step-by-step Solutions
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Q
Q: In a survey, the average age of 10 people is 30 years. If one person aged 40 leaves, what will be the new average age?
Solution:
Total age = 10 * 30 = 300. New total age = 300 - 40 = 260. New average = 260 / 9 = 28.89.
Steps: 4
Show Steps
Step 1: Calculate the total age of the 10 people. Since the average age is 30 years, multiply 30 by 10. Total age = 30 * 10 = 300.
Step 2: One person aged 40 leaves, so subtract 40 from the total age. New total age = 300 - 40 = 260.
Step 3: Now, there are 9 people left. To find the new average age, divide the new total age by the number of people left. New average = 260 / 9.
Step 4: Calculate 260 divided by 9, which is approximately 28.89.
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