Answer:
We can expect 3 sundaes must have nuts out of 9.
Explanation:
Number of frosted sold contains nuts = 2
Number of frosted sold does not contain nuts =4
We need to find the expected value of frosted containing nuts for 9 sundaes.
Solution:
First we will find the total number of sundaes bought.
Now we can say that;
total number of sundaes bought is equal to sum Number of frosted sold contains nuts and Number of frosted sold does not contain nuts.
framing in equation form we get;
total number of sundaes bought =

Now we will find the percent of frosted sold contains nuts.
percent of frosted sold contains nuts can be calculated by dividing Number of frosted sold contains nuts total number of sundaes bought and then multiplying by 100.
framing in equation form we get;
percent of frosted sold contains nuts =

Now we need to find the Number of frosted sold contains nuts when total number of sundaes bought is 9.
Number of frosted sold contains nuts can be calculated by multiplying percent of frosted sold contains nuts from number of sundaes bought.
framing in equation form we get;
Number of frosted sold contains nuts =

Hence We can expect 3 sundaes must have nuts out of 9.