6 1/9 + 2 2/9 simpfly

b.  mean: 42, mode: 46

Step-by-step explanation: if x1,x2,x3,...,xn are n observations then

mean=( x1+x2+...+xn)/n and mode is the element having the highest frequency i.e. element occuring most of the time

mean=(59+16+57+46+58+21+36+41+23+64+20+66+40+51+28+46)/16

        =42

46 occurs twice while all other numbers occur only once so, mode=46