Be my Valentine: The following frequency distribution presents the amounts, in dollars, spent for Valentine's Day gifts in a survey of 120 U. S. adults in a recent year. Approximate the mean amount spent on Valentine's Day gifts to two decimal places. Amount Frequency0-19.99 16 20.00-39.99 1340.00-59.99 21 60.00-79.99 19 80.00-99.99 12 100.00-119.99 10 120.00-139.99 7140.00-159.99 8160.00-179.99 7180,00-199.99 1200.00-219.99 3220.00-239.99 2240.00-259.99 1

the mean is 82.75

Step-by-step explanation:

Amount                   Frequency             Mid Point           fx

0-19.99                             16                    9.995            159.92  

20.00-39.99                    13                   29.995          389.935

40.00-59.99                     21                    49.995        1049.895

60.00-79.99                      19                   69.995         1329.905

80.00-99.99                       12                89.995           1079.94

100.00-119.99                     10                109.995          1099.95

120.00-139.99                     7                 129.995              909.965

140.00-159.99                      8                  149.995            1199.96

160.00-179.99                       7                  169.995          1189.965

180,00-199.99                      1                    189.995         189.995

200.00-219.99                    3                    209.995        629. 985

220.00-239.99                    2                   229.995         459.99

240.00-259.99                    1                   249.995         240.995

∑                                         120                                           9930.4

Mean = ∑fx/∑x

Mean = 9930.4/120=82.7533 = 82.75

john earns $14.00 for two hours of work.

company a

step-by-step explanation:

using the linear regression models , it is found that company a   pays about $14 more. but using the same regression (linear) company b pays about $10 more.

so company a pays more than b