A salesman wants to know the average number of units he sells per sales call. He checks his past sales records and comes up with the following probabilities:: Sales (in units): 0 1 2 3 4 5 Probability 0.15 0.20 0.10 0.05 0.30 0.20 . What is the average number of units he sells per sale call?

A dealer in refrigerators estimates from his past experience the probabilities of his selling refrigerators in a day. These are as follows: No of refrigerators sold in a day: 0 1 2 3 4 5 6 Probability 0.03 0.20 0.23 0.25 0.12 0.10 0.07 Find the mean number of refrigerators sold in a day.

A random variable X has the following probability distribution : {:(X:,1,2,3,4,5,6,7,8),(P(X):,0.15,0.23,0.12,0.10,0.20,0.08,0.07,0.08):} for the events E= [X is a prime number] F={Xlt 4} , the probability P(EUF) , is.

A random varibale X has the following probability distribution. {:(X:,1,2,3,4,5),(P(X):,0,0.1,0.2,0.3,0.4):} Find the mean.

A salesperson recorded her sales during a particular 5-day work week, shown in the table above, in order to study her daily sales. The salesperson wants to increase her averages sales per day by 20% in the following week. Given the information in the chart above, what should her daily sales average be for the following week?

A sample of AIF_(3) contains 3.0 xx 10^(24) F^(-) ions. The number of formula units of the sample are

A special die with numbers 1,-1,2,-2,0 and 3 is thrown thrice. What is the probability that the total is (i) Zero , (ii) 6 ?

Find the mean and standard deviation of each of the following probability distribution: x_i :1\ \ 3\ 4\ 5 p_i : 0.4\ 0. 1\ 0. 2\ \ 0. 3

A biased die is tossed and the respective probabilities for various faces to turn up are {:("Face",:,1,2,3,4,5,6),("Probability",:,0.1,0.24,0.19,0.18,0.15,0.14):} If an even face has turned up, then the probability that it is face 2 or face 4, is

Check whether the following numbers are in proportion or not : 3.6, 0.4, 4.5, 0.5

Force and area are measured as 20N and 5 m^2 with errors 0.05 N and 0.0125 m^2. The maximum error in pressure is (SI units)