Assuming that the number of accidents that occur in a certain company in a week has a Poisson distribution with a standard deviation of 1.4 . Determine: a) the mean number of accidents that occur in a week b) the probability that in a week, there are no accidents.

What is the definition of a compound event in probability?

construction company classifies its work force as low risk if they are accident free. Past records indicate that 97 \( \% \) of drivers in the low-risk category (L) remain in the low - risk category in the next year and \( 76 \% \) of drivers not' in the low-risk category (L) in one year will be in the low - risk category the next year. If \( 83 \% \) of the work force are in the low-risk category this year, what is the probability that an employee chosen at random will be in the low-risk category the year after next.

What is the definition of a compound event in probability?

Что такое составные события в теории вероятностей?

4 (a) A box contains 40 identical discs which are either red or white. If the probability of picking a red disc is \( \frac{1}{4} \); Calculate the number of (i) white discs ; (ii) red discs that should be added such that the probability of picking a red disc will be \( \frac{1}{3} \). (b) A salesman bought some plates at N50.00 each. If he sold all of them for N600.00 and made a profit of \( 20 \% \) on the transaction, how many plates did he buy?