Kianna and her friends collected pledges for a local walk-a-thon.
They recorded the number of pledges they each received in a frequency table.
Chart with Pledges and their Frequency. 30 to 39 has frequency as 1, 40 to 49 has frequency as 7, 50 to 59 has frequency as 4 and 60 to 69 has frequency as 1.
How many walkers received more than 39 pledges?
A. 13
B. 11
C. 7
D. 12