Answer:
B. 21.5
Explanation:
Median is the center value in a list of numbers arranged in ascending order.
In this case, values given in the list are in increasing order ;
10 , 11, 12, 15, 19, 24, 27, 29, 33 ,38 --------identify the middle value
The middle position has two values , 19 , 24 ---------find the average
( 19+24 )/ 2
43 / 2 = 21.5
The median is 21.5 (answer choice B).
Choice A is incorrect because sum of middle values (43) divided by two is not 21.8 .It is 21.5
Choice C and D are incorrect because 19 and 24 are both at the middle of the list of numbers so to get the correct median you get the average of the two middle values.