The graph shows the increase of cost of strawberries per pound in dollars, y, over a period of years, x. What is the rate of inc
rease of the cost of strawberries per pound?
2 answers:
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Let the total sum of the scores of the first class of 35 students be a. The mean is 74.3 .
So
Also, let the total sum of the scores of the second class of 28 students be b. The mean is 67.6 .
so
The combined group has 35+28=63 students. The sum of their scores is
a+b=2600.5+1892.8=4493.3
Thus, the mean of the combined group is
So
Also, let the total sum of the scores of the second class of 28 students be b. The mean is 67.6 .
so
The combined group has 35+28=63 students. The sum of their scores is
a+b=2600.5+1892.8=4493.3
Thus, the mean of the combined group is