Use the standard deviation equation attached to work this one out. They have given you totalX^2 and sum of X and n, just substitute and work through.
It’s making me use 20 characters so here’s a lil text
U²-2uv-48v²
u(u-8v)+6v(u-8v)
(u+6v)(u-8v)
For this case we have the following equation of the potential type:
y = A (b) ^ t
Where,
y: number of people with cell phones
A: initial number of people with cell phones
b: growth rate
t: time
Substituting values:
y = 275 * (1.82) ^ t
For the year 2000 we have t = 8.
Substituting:
y = 275 * (1.82) ^ 8
y = 33105.77794
nearest whole integer:
y = 33105
Answer:
there were 33105 cellphone users in 2000