Question

a random sample of students was surveyed and asked to list their grade level and what movie genre they prefer. results are shown in the table below.
movie genre
\t\tsuperhero\tcomedy\tdrama
6th grade\t19\t14\t5
7th grade\t11\t11\t11
8th grade\t11\t20\t19
how many students were surveyed?

Explanation:

Step1: Sum up all the values in the table

$$19 + 14+5+11 + 11+11+11+20+19$$

Step2: Calculate the sum

First, group the numbers:
$$(19 + 11)+(14 + 20)+(5 + 19)+(11 + 11+11)$$
$$=30+34 + 24+33$$
Then add them together:
$$30+34=64$$
$$64+24 = 88$$
$$88+33=121$$

Answer:

121