A group of students were given a spelling lest.
The table shows their marks.
Mark
a) Work out the range of the marks.
Frequency
6 I 5
7 I 4T
8 7
9 10
10 T 4
b) How many students are in the group?
c) Work out the mean mark of the group.
range:
students
mean:

the answer is 200

step-by-step explanation:

the way the question is worded, it seems to imply the $264 interest is simple interest, not compound interest.

the simple interest for 2 years is $264; the simple interest for 1 year is $132.

$132 interest on a $600 investment means an interest rate of (132/600)*100 = 22%.

the value of $200 at 22% interest compounded annually for three years is

200%281.22%29%5e3

the amount of interest is that value, minus the original $200.