Question

Karen recorded the numbers of people getting off her tram.
The mean number for 10 stops is 6.3.
After the tram stops at the 11th stop, the mean is 8.6.
How many people got off the tram at the 11th stop?

Answer 1

Answer: 32

Step-by-step explanation:

Sum of n observations = n x Mean of n observations

Given: The mean number for 10 stops =  6.3.

Sum of people getting off from these 10 stops = 10 x 6.3 = 63

After the tram stops at the 11th stop, the mean is 8.6.

Sum of people getting off from these 11 stops = 11 x 8.6  = 94.6 ≈ 95

Number of  people got off the tram at the 11th stop = 95-63 = 32