Question
please help to solve
Which of the following random variables would have an exponential distribution? a. The number of levels you mastered in Candy Crush b. The number of minutes that pass until you master the next level in Candy Crush c. The number of Facebook friends who also play Candy Crush d. The number of lives lost on Candy Crush until a friend sends you one. e. The number of minutes you spend playing Candy Crush each day. f. More than one of these describes an exponentially distributed random variable. It takes the average mechanic 27 minutes to change the oil in 3 cars. If the time it takes a mechanic to change the oil in a car is exponentially distributed, what is the value of mu? a. 27 minutes b. 1/9 car per minute c. 81 car minutes d. 3 cars e. 9 minutes per car
Explanation / Answer
1) as exponential distribution is a continuous distribution. therefore option b and e are exponential distribution
hence option f is correct
2)average time to change oil in 1 car =27/3 =9 minutes/per car ; option e is correct.
