When she was in year 8, sarah could run 800m in 3 minutes and 20 seconds three years later, when she was in year 11 she could run 800 metres in 2 minutes and 44 seconds. find the percentage improvement in her time

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

How many heads would you expect if you flipped a coin twice? first, fill in the table below with the correct probabilities. hint: the sample space for flipping a coin twice is {hh, ht, th, tt}. a = b = c = f

Is the number 128.439 a rational number