stem leaf\n1 2, 4, 5, 7, 7, 8\n2 0, 2, 7, 8, 9\n3 1, 3\nwhat is the mean of this set of data?

Answer:

$20.5$

Explanation:

Step1: Write out the data set

$12,14,15,17,17,18,20,22,27,28,29,31,33$

Step2: Calculate the sum of data

$12 + 14+15+17+17+18+20+22+27+28+29+31+33=266.5$

Step3: Determine the number of data points

There are $n = 13$ data - points.

Step4: Calculate the mean

Mean=$\frac{266.5}{13}=20.5$