Question

the mean of 5 numbers is 85. the largest number is 100. what is the mean of the other four numbers?
a 80
b 81.25
c 84.5
d 86.4

Explanation:

Step1: Find total of 5 numbers

Total = Mean × Count = $85 \times 5 = 425$

Step2: Subtract the largest number

Sum of 4 numbers = $425 - 100 = 325$

Step3: Calculate mean of 4 numbers

Mean = $\frac{\text{Sum of 4 numbers}}{4} = \frac{325}{4} = 81.25$

Answer:

B 81.25