The average of numbers is . When a new number, , is added, what is the new average?
Answer and explanation
Correct answer: C. 20
- Step 1: Find the initial total sum of the 4 numbers: .
- Step 2: Add the new value 36 to determine the new total sum: , with the count increasing to .
- Step 3: Divide the new sum by the new total count to compute the new average: .
Answer
20.
Practise more Data analysis.
Free questions with an explanation for every one, and full timed GMAT mock tests.
More Data analysis questions
- The average of numbers is . When a new number, , is added, what is the new average?
- The average of numbers is . When a new number, , is added, what is the new average?
- The average of numbers is . When a new number, , is added, what is the new average?
- In a group of people, read magazine A, read magazine B, and read magazine C. Also, read both A and B, read bo…
- The average score of students is . The boys averaged and the girls averaged . How many boys are there?
- A fair coin is tossed times. Given that at least one toss is heads, what is the probability that at least tosses are heads?