Does anyone have the mark scheme to this exam http://greenbankschool. org/serve_file/447494

If not could anyone take a look at these questions and see if they could answer any questions from it and tell me them

any answers would be appreciated(like question 19, this one is the one i need most help with)

An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.

Use your knowledge of the binary number system to write each binary number as a decimal number. a) 1001 base 2= base 10 b) 1101 base 2 = base 10

The price of one share of a company’s stock declined $13.89 every day for 2.5 days what was the stocks total decline in price