Which product is negative? −3⋅4⋅(−2)⋅(−7) −4⋅(−6)⋅(−3)⋅(−5) −7⋅(−3)⋅(−9)⋅0 −3⋅5⋅(−6)⋅4

Afrequency table of grades has five classes (a, b, c, d, f) with frequencies of 3, 13, 14, 5, and 3 respectively. using percentages, what are the relative frequencies of the five classes?

The mean of 10 values is 19. if further 5 values areincluded the mean becomes 20. what is the meanthese five additional values? a) 10b) 15c) 11d) 22

42. if 20 men can eat 200 kg of wheat in 40 days, then 10 men can eat 300 kg of wheat in how many days? a) 120 days b) 60 days c) 80 days d) none of these