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The count of the sections the class should label as "Chocolate Ice Cream" is 3.
<h3>How to calculate the probability of an event?</h3>Suppose that there are finite elementary events in the sample space of the considered experiment, and all are equally likely.
Then, suppose we want to find the probability of an event E.
Then, its probability is given as
where favorable cases are those elementary events who belong to E, and total cases are the size of the sample space.
For the considered case, it is given that:
Probability of an student getting Chocolate Ice Cream for dessert at lunch = 30% = 0.3
The count of the sections the class should label as "Chocolate Ice Cream" should be such that spinner getting "Chocolate Ice Cream" as option should have the probability as 0.3
Let the count of the sections the class should label as "Chocolate Ice Cream" be
Then, as there are in total 10 sections in the spinner, and all sections are assumingly equally probable, thus, if the event E is:
E = event of getting "Chocolate Ice Cream" in the spinner ,
then as n(E) = (as there are
sections with label "Chocolate Ice Cream")
and n(S) = total count of sections (size of sample space) = 10
Thus, we get probability of event E as:
This needs to be equal to 0.3, thus,
Thus, the count of the sections the class should label as "Chocolate Ice Cream" is 3.
Learn more about probability here: