# Question: The following are the times to failure of 38 light

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