Question

For two weeks the school librarian recorded the number of library books returned each morning. The data are shown in the dot plot. The librarian found the mean number of books returned each morning.

DOT PLOT
0 has 2 dots 1 has 0 dots 2 has 0 dots 3 has 1 dot 4 has 0 dots
5 has 1 dots 6 has 2 dots 7 has 0 dots 8 has 2 dots 9 has 1 dot
10 has 1 dot 11 has 0 dots
LIBRARIANS WORK
8 + 6 + 10 + 5 + 9 + 8 + 3 + 6 55
------------------------------------------------- = ---- = 6.9
8 8

Is this the correct mean of this data set? If not, explain and correct this answer

Answer 1

x

Explanation:

Answer 2

The mean that the library and calculated is not correct. Her mistake was she divided 55 by 8 instead of dividing by 10.

Please see the attached picture for the work in finding the correct mean of 5.5 books.