Donations to charity are discretionary expenses. Ian a class of 30 students 6 students donated $5 each to relay for life, 15 students donated $10, and $9 students $20 each. Find the standard deviation for this distribution.

So don't take my word i'm not exactly a mathematical person but i would assume a. because while selling the soap every month you increase in sells so you would by 11 percent. the you would get the factor 0.89 which if i had to guess would be the monthly profit over 11 probably wrong tho