Question

The following nine values represent race finish times in hours for a randomly selected group of participants in an extreme 10 km race (a 10 km race with obstacles). Which of the following is closest to the mean of the data set?
1.0,1.1,1.2,1.2,1.3,1.4,1.4,1.4,1.5
a) 1.1 hours.
b) 1.5 hours.
c) 1.3 hours.
d) 1.6 hours.

Answer 1

Answer:

c) 1.3 hours.

Step-by-step explanation:

The mean of a data set is given by the sum of it's values divided by the number of values.

In this question, we have that:

Nine values.

The sum of them is:

1 + 1.1 + 1.2 + 1.2 + 1.3 + 1.4 + 1.4 + 1.4 + 1.5 = 11.5

The mean is

11.5/9 = 1.28

So closest to 1.3 hours, and the answer is given by option c.