4. A school has a toy drive for a holiday in which students bring in toys to be donated to charity. The number of toys donated by juniors and seniors are summarized in the histograms. 55 55 50 50 45 45 40 40 35 35 30 30 number of juniors number of seniors 25 25 20 20 15 15 10 10 5 5 0 0 4 8 0 2 4 2 10 number of toys donated to charity 6 8 10 number of toys donated to charity Is the standard deviation of number of toys donated greater for seniors or juniors?