Atelevision station claims that the amount of advertising per hour of broadcast time has an average of 14 minutes and a standard deviation equal to 2.4 minutes. you watch the station for 1 hour, at a randomly selected time, and carefully observe that the amount of advertising time is equal to 8 minutes. calculate the z-score for this amount of advertising time.

 -2.5

Step-by-step explanation:

Given : A television station claims that the amount of advertising per hour of broadcast time has an average of 14 minutes and a standard deviation equal to 2.4 minutes.

i.e.

Let x be the random variable that represents the amount of advertising per hour.

The formula to find the z-score :-

For x= 8 , we have

Hence, the z-score for this amount of advertising time = -2.5

a) one student is chosen from classroom a, then a student is chosen from classroom b.  

step-by-step explanation:

independent events are ones in which the probability of one event does not affect the probability of the second event.

one student is chosen from classroom a; this does not affect the chances of choosing a student from classroom b.   this makes these independent events.

when one card is chosen from a standard deck and then set aside before a second card is chosen, the probability of the second card being chosen changes.   this makes them dependent events.

when one student is chosen from classroom a and then a second student is chosen from classroom a, the probability of choosing the second student changes.   this makes them dependent events.

when a letter is chosen from the alphabet and then a second letter is chosen, the probability of choosing the second letter changes.   this makes them dependent events.

bull

step-by-step explanation: