Weighted Mean - HP 10bII+ User Manual

Table 12-10 Example for forecasting
Keys
\Z\«
Estimate what the level of sales would be if the business purchased 7 or 8 minutes of
advertising.
Table 12-1 1 Estimating the level of sales
Keys
j\W
g\W
How many minutes of advertising should Ali's buy to attain sales of 3,000?
Table 12-12 Estimating the minutes of advertising for 3,000 sales
Keys
D:::\Z

Weighted Mean

The following procedure calculates the weighted mean of data points x
with weights y , y
1
Æ
1. Use and
\T
2. Press
Example 5
A survey of 266 one-bedroom rental apartments reveals that 54 of them rent for 500 per
month, 32 for 505, 88 for 510, and 92 for 516. What is the average monthly rent?
124 Statistical Calculations
, ..., y .
2 n
¡
to enter x,y pairs. The y-values are the weights of the x-values.
.
Display Description
0.90 Calculates correlation
coefficient.
Display Description
3,357.38 Estimates sales if 7 minutes of
advertising were purchased.
3,783.25 Estimates sales if 8 minutes were
purchased.
Display Description
6.16 Estimates minutes of advertising
required for 3,000 in sales.
, x , ..., x occurring
1 2 n