Answer
See file for graph
From graphing the graph
Slope: $0.1637$ g/kernel
Slope represents the average mass of a popcorn kernel
Mass of 20 popcorn kernels = $3.370g$
There are 127 kernels in a sample with a mass of $20.88g$
Work Step by Step
To make the graph you can use a linear regression on a calculator
From the linear regression the equation that you are given the slope is the number that is the coefficient to the $x$
To determine the mass of 20 popcorn kernels:
$\frac{20 popcorn kernels}{1}$ * $\frac{0.1637g}{1 kernel}$ = $3.370g$
To determine how many kernels are in a sample with a mass of $20.88g$
$\frac{20.88g}{1}$ * $\frac{1 kernel}{0.1637g}$ = $127$ kernels
