Question

SOLVED

its 160

The table shows the number of mobile cellular subscriptions per 100 people in Australia for different years.

Year | Cellular subscriptions / 100 people

1993 | 4 12 25 33 57 72 90 101 101 108

1995 | 12

1997 | 25

1999 | 33

2001 | 57

2003 | 72

2005 | 90

2007 | 101

2009 | 101

2011 | 108

The quadratic regression equation using the years since 1990 for the input variable and the number of cellular subscriptions for the output variable is y=−0.107x^2+9.008x−28.851

What is the predicted number of cellular subscriptions per 100 people in Australia in 2030?

Round your answer to the nearest whole number. Enter your answer in the box.
Nvm its 160

Answer 1

160

Explanation:

x represents the years since 1990, so at 2030, x = 2030 - 1990 = 40. Replacing this value into the quadratic regression equation, we get:

y = -0.107(40)^2 + 9.008(40) - 28.851 = 160

which is the predicted number of cellular subscriptions per 100 people in Australia in 2030