This is what I have so far:

```
echo "Please enter your first number: "
read a
echo "Second number: "
read b

```

(etc..)
That works fine, but when I tried to set a function for sum average and product, I ran into some problems.

This is what I tried:

```
sum= ($a + $b + $c + $d + $e)
avg= ($sum / 5) #The five was showing up in red text
prod= ($a * $b * $c * $d * $e)

echo "The sum of these numbers is: " $sum
echo "The average of these numbers is: " $avg
echo "The product of these numbers is: " $prod

```

but when I ran it (after I inputted the numbers 1,2,3,4,5) I got this back:

```
The sum of these numbers is: 1 + 2 + 3 + 4 + 5
The average of these numbers is:  1 + 2 + 3 + 4 + 5 / 5
The product of these numbers is: 1 * 2 * 3 * 4 * 5

```

So my question is how do I get these functions to compute within the () 

Any help is appreciated, thanks.