Question 2 The speeds of cars are measured using a radar unit, on a motorway. The speeds are normally distributed with a mean of \( 90 \mathrm{~km} / \mathrm{hr} \) and a standard deviation of \( 10 \mathrm{~km} / \mathrm{hr} \). What is the probability that a car selected at chance moves at more than \( 100 \mathrm{~km} / \mathrm{hr} \) ? Add your answer Integer, decimal, or E notation allowed

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?

What are dependent events in probability?

What are dependent events 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.