The mean of 4 numbers is 81. Of them, 3 are 93, 88, 90. What is the remaining number?
Answer and explanation
Correct answer: D.
- Step 1: Total of all numbers: . Step 2. Sum of the given numbers: . Remaining number: . **Answer: . Why not the others:** assumes the missing number equals the mean; adds the count to the answer; divides by the wrong count.
Practise more Mixed problems.
Free questions with an explanation for every one, and full timed SEE (Secondary Education Examination, Nepal) mock tests.
More Mixed problems questions
- The price of a sofa is 800. It is first increased by 25% and then the new price is decreased by 10%. What is the final price?
- 75% of a number is 225. What is the number?
- What is the difference between the compound interest and the simple interest on 4000 for 3 years at 8% per year (compounded annually)?
- A rectangle has length 14 cm and width 7 cm. A square of side 1 cm is cut from one corner. What is the area of the remaining shape, in cm…
- A right triangle has legs of length 12 and 16. What is the length of its hypotenuse?
- A jar contains 3 red and 4 blue counters. Two counters are drawn at random without replacement. What is the probability that both are red?