Five boys have a mass, given to the nearest 10kg, of: 40kg, 50kg, 50 kg, 60 kg and 80 kg. Calculate the least possible total mass.

(40 points) i need some . an answer definition is appreciated as well.

Noor brought 21 sheets of stickers. she gave 1/3 of a sheet to each of the 45 students at recess. she wants to give teachers 1 1/2 sheets each.

An optical inspection system is used to distinguish among different part types. the probability of a correct classification of any part is 0.92. suppose that three parts are inspected and that the classifications are independent. let the random variable x denote the number of parts that are correctly classified. determine the probability mass function of x. round your answers to four decimal places (e.g. 98.7654). x f(x) 0 1 2 3