True or false answers?

10 ll 12 13 14 15 16 17 18 19 20 Original class interval frequencies can be obtained by multiplying the respective relative frequencies by the total number of observations The following data, reported by a sample of students, are the number of movies seen in a movie theatre during past six months. 6 6 9 12 6 4 8 15 E5 The frequency of students who saw 6 movies is 6. The arithmetic mean is the sum of the data values divided by the number of observations. P[A n B) is PiBlAinta) P [A n B :I =0 means that A and B are mutually exclusive events. Mutually exclusive events imply that if one event occurs, the other cannot occur. An event (e.g., A ) and its complement are always mutually exclusive. P IIAfI+P II A): 1 When events are not mutually exclusive, the rule is: P [A U BEZP II AHP [B :l P [ A n B) Rule of addition when event are mutually exclusives: P [A U B :l: P I: A] +P | B :I PI'B n A) is not PI'A|Bj|*P(B} The P(x) is always 0 5 P(x) 5 1. Events are independent when the occurrence of one event has no effect on the probability that another will occur