URGENT!!! Please solve ASAP

8. James believes strongly that it is not possible to 'beat' the market. Chris disagrees. He takes two years' worth of trading data for the FTSE Index, and then looks at how stocks perform on different days of the month. He looks at the first 20 business days of all months (because there are some months which don't have 21 or more business days.) He finds that the best day of the month is business day 3 on which stocks return 0.45%, with a standard deviation of 1.00%. Does Chris have enough information to challenge James' view