91影视

Survey data:

Look at the bottom right corner of the table,

There are $335$students in total.

Thus,

The number of possible outcomes is $335$.

Also,

For the student who are rated good grades or 6^th grader,

Add up all the values in column 鈥淕rades鈥� and row 鈥�6th grade鈥�, we will get $234$in total.

Thus,

The number of favorable outcomes is $234$.

Now,

The number of favorable outcomes divided by the number of possible outcomes gives the probability.

$$\begin{gathered} P(6^{th}gradeorgrades)=\frac{Numberoffavorableoutcomes}{Numberofpossibleoutcomes} \\ =\frac{234}{335} \\ =0.6985 \end{gathered}$$

Look at the bottom right corner of the table,

There are $335$students in total.

Thus,

The number of possible outcomes is $335$.

Also,

For the student who did not rate good grades and not a 6^th grader as well,

Add up all the values of 4^th and 5^th grades in the columns 鈥淎thletic鈥� and 鈥淧opular鈥�, we will get $101$in total.

Thus,

The number of favorable outcomes is $101$.

Now,

The number of favorable outcomes divided by the number of possible outcomes gives the probability.

$$\begin{gathered} P(Not{6}^{th}graderandnogrades)=\frac{Numberoffavorableoutcomes}{Numberofpossibleoutcomes} \\ =\frac{101}{335} \\ 鈮�0.3015 \end{gathered}$$