The average life expectancy in the United States, L, has been rising steadily over the past few decades, as shown in the table below. Let u be the number of years since 1920, (so I = 0 represents the year 1920).
Year
1920 1930 1940 1950 1960 1970 1980 1990
Life expectancy 54.6 57 60.2 62.3 66.1 69.4 72.6 74.4
(a) Find the equation of the regression line.
Average life expectancy, L(2) =
(b) Estimate the average life expectancy in the United States in the year 1952 according to the linear model in part (a).
Average life expectancy in 1952

greater than one

step-by-step explanation:

7

step-by-step explanation:

if gloria has "carry over" minutes, (that is, any minutes paid for but not used in a month can be applied to her payment for minutes in the next month,) her total usage for the three months is: total minutes = 320 + 243 + 489 = 1052 minutes number of 200 minute blocks = 1052/200 = 5 r52 (that is 5 with a remainder of 52) rounding up the number of 200 minute blocks gives her usage for the three months as 6 blocks. the cost for six blocks is 6 x $25 = $150 she also has 200 - 52 or 148 carry over minutes if gloria pays each month and unused minutes are lost, applying the rounding up procedure to each month gives: first month usage of 320 minutes rounds up to 2 blocks of 200 minutes for a payment of 2 x $25 = $50 second month usage of 243 minutes rounds up to 2 blocks of 200 minutes for a payment of 2 x $25 = $50 third month usage of 489 minutes rounds up to 3 blocks of 200 minutes for a payment of 3 x $25 = $75 total payments for the three months are $50 + $50 + $75 = $175 get the plan with carry over minutes!