11. The ages (in years) of 11 children and the number of words in their vocabulary. Find the correlation coefficient r.
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Answer:
\\x= P/(c -d)[/tex],
Assume that the price of each minute in the first plan is $c and that the second plan charges a flat rate of $P and a charge of additional $d for every minute.
Step-by-step explanation
Assume that the price of each minute in the first plan is $c and that the second plan charges a flat rate of $P and a charge of additional $d for every minute.
Thus, the monthly cost of a customer who consumes x minutes in each plan is:
For the first plan:
and for the second plan:
Considering that the monthly costs must be the same in each plan, you have to:
\\x= P/(c -d)[/tex].
For example if , Then the number of minutes would be,
and the total cost for each plan would be