Answer:
273.075 millions users
Step-by-step explanation:
We can use the date and users as x and y values for our graph.
point 1 = (1994, 37.5)
point 2 = (1998, 70.0)
point 3 = (2002, 102.5)
We know that linear equation can be represented as y = mx + b
where m is the slope and b is the y intercept value when x equal to 0.
m = (y2 -y1)/(x2-x1) = (102.5 - 37.5)/(2002 -1994)
m = 8.125
Now let's solve for b by using point3 values.
102.5 = 8.125(2002) +b
b = -16163.8
Now predict two years from now. Which is the year 2023.
For year 2023, how many mobile phone usage?
y = 8.125(2023) - 16163.8
y = 273.075 millions users
As for model robustness(reliability), it's fairly good be cause all three data points have consistent 8.125 slope. So the predictivity is fairly accurate.
