Na city with three high schools, all the ninth graders took a standardized test, with these results: high school mean score on test number of ninth graders glenwood 79 251 central city 95 316 lincoln high 65 187 the city's pr manager, who never took statistics, claimed the mean score of all ninth graders in the city was 79.7 . of course, that is incorrect. what is the mean score for all ninth graders in the city? round to one decimal place. mean of all ninth grader's scores =

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.

there are 25 people coming to the party

step-by-step explanation:

the text says that there will be 22 children at this party, 1 teacher, and 2 parents. so if you add them all together (22+1+2) it will equal 25. (=25)