A 3-column table with 4 rows. Column 1 has entries Catfish, bass, trout, all fish. Column 2 is labeled Sample 1 with entries 3, 9, 8, 20. Column 3 is labeled Sample 2 with entries 5, 9, 6, 20. The proportion used to find the average number of trout you would expect to live in the pond is 7 20 = x 400 . Solve the proportion to find the expected number of trout in the population. The expected number of trout in the population is .

140  

Step-by-step explanation:

The table is:

               |Sample 1      | Sample 2

catfish     | 3                 | 5

bass         | 9                 | 9

trout         | 8                 | 6

all fish      | 20               | 20

The average number of trouts is (8 + 6)/2 = 7

The average number of the total amount of fish is 20

So, there are 7 trouts within 20 fish. To find the expected number of trouts in a population of 400 fish, we have to solve the next proportion:

7 trouts / 20 fish = x trouts / 400 fish

x = 7*400/20

x = 140 trouts

9 sandwiches per hour

step-by-step explanation:

when we have a rate, we want a 1 in the denominator

27/3 = 9

27 sandwiches/ 3 hours = 9 sandwiches/hour

he earned 78.75 in interest.

step-by-step explanation: