1 A market trader sells ball-point pens on his stall. He sells the pens for a different fixed price. x pence, in each of six
1 A market trader sells ball-point pens on his stall. He sells the pens for a different fixed price. x pence, in each of six weeks. He notes the number of pens, y, that he sells in each of these six weeks. The results are shown in the following table. 10 15 20 25 30 35 68 60 55 48 38 32 Calculate the equation of the least squares regression line of y on x
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