Susan makes 5 fruit cups for the picnic.in each cup,she has 5 strawberries and 3 kiwi. joanna uses the same number of total fruits to make her strawberry and kiwi fruit cups,but she uses 4 cups. in each cup she uses 8 strawberries. how many are in each fruit cup joanna makes?

For every One cup that Susan makes she has five strawberries and three kiwis. For every 1 cup that Joanna makes, there are eight strawberries. So now we have to figure out how many kiwi that are in her cup. So if there are eight strawberries we were going to add one for the kiwi and that will be nine. So for Joanna she uses eight strawberries and nine kiwis

Relative frequency = event/sample space
50/14 = 0.28

Expected probability = relative frequency*event
0.28*7500 = 2100 
About 2100 trout is expected to be in the lake.