mean variance

= np (p+q) n - 1 ..

Let X be a discrete random variable which can assume values x 1 , x 2 , x 3 ,x n with probabilities p 1 , p 2 , p 3 .. p n respectively then (a) Mean of X or expectation of X denoted by E(X) or m is given by (b) Variance of X denoted by s 2 is given ..

30% of the death cases in a hospital are caused by accidents. If 250 cases are selected at random, then find the mean, variance and standard deviation of the number of death cases caused by accidents. => 75, 7.24, 52.5 or 52.5, 75, 7.24 or 7.25, 52.5, 75 or 75, 52.5, 7.24..

The mean for the number of viewers of a sample of entertainment programs is 132, with a variance of 23. The mean for the number of advertisements of a sample of entertainment programs is 182, with a variance of 62. Compare the variations. => The number of vie..

In a school, 40% of the students play basketball. If 400 students are selected at random, then find the mean and variance of the number of students who play basketball. => 160, 9.8 or 96, 160 or 96, 9.8 or 160, 96..

In a factory manufacturing umbrellas, it was found that 90% of packages (containing 100 umbrellas each) did not have any defective umbrellas, 5% contained 1 defective unit each and 3% contained 2 defective units each and 2% contained 3 defective units. Find the mean, variance an..

A survey found that 54% of the people believed that Andy Roddick would win this year's US Open. If 250 people are selected at random, then find the mean and variance of the number of people who believe that Andy Roddick would win this year's US open. => 135, 7.88 or 135, 62.1 or..

The means of each group of a two-way analysis of variance for two independent variables are plotted as shown in the graph. What does the graph represent about the interaction of the variables? => Disordinal interaction or Ordinal interaction or No interaction..

The means of each group of a two-way analysis of variance for two independent variables are plotted and shown in the three graphs. Which of these represents an ordinal interaction? Consider the interaction to be significant. => Graph 2 or Both graph 1 and graph 2 or Graph 3 or G..

The average size of a farm in one country is 200 acres and in another country it is 280 acres. If the standard deviations are 34 and 10 and sizes are 10 and 15, then find if the variances and mean sizes of each farm differ significantly at α = 0.1. => variances d..