A market trader sells mobiles on his stall. He sells the mobiles for a different fixed price, x mobiles in each of six weeks. He notes the number of mobiles, y that he sells in each of these six...

A market trader sells mobiles on his stall. He sells the mobiles for a different fixed price,  x mobiles in each of six weeks. He notes the number of mobiles, y  that he sells in each of these six weeks. The results are shown in the following table:

• Find the coefficient of correlation and interpret it.


• Calculate the equation of the regression line of ? on x y^∗
  = a + bx 3


• If he sells 10 mobiles, how many weeks he will take to sell?