13-37 3-4 i D =3.416 3 - 21. Kosgei gave his three children Chemutai, Kibet and Lanagat some mone Chemutai got of what Kibet got and Langat got Ksh 2000 less than Ki 4. If the total amount was Ksh 53 000, determine what each child got. (4 mark Kosgeis Chemutai = 34 0f kibet Kibet Lanagat:2000 less than kibet got

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.