# Question

The following are the times to failure of 38 light bulbs, given in hours of operation.

(a) Dropping the rule that class intervals must be equal, construct a frequency distribution from these data.

(b) Can you find the class mark of every class?

(a) Dropping the rule that class intervals must be equal, construct a frequency distribution from these data.

(b) Can you find the class mark of every class?

## Answer to relevant Questions

If X has the distribution function Find (a) P(X ≤ 3); (b) P(X = 3); (c) P(X < 3); (d) P(X ≥ 1); (e) P(- 0.4 < X < 4); (f) P(X = 5). Find the distribution function of the random variable X of Exercise 3.17 and use it to reevaluate part (b). The probability density of the random variable Z is given by Find k and draw the graph of this probability density. Find the distribution function of the random variable X whose probability density is given by Also sketch the graphs of these probability density and distribution functions. If the values of the joint probability distribution of X and Y are as shown in the table Find (a) P(X = 1, Y = 2); (b) P(X = 0, 1 F Y < 3); (c) P(X + Y F 1); (d) P(X > Y).Post your question

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