SOLUTION: Cool tel is large mobile service provider it has conducted a study on 10000 customers about length of time they have to wait at its customer care centres before being facilitated b

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Question 1192106: Cool tel is large mobile service provider it has conducted a study on 10000 customers about length of time they have to wait at its customer care centres before being facilitated by cool's officer the results of study are
waiting time (min) 0 1 2 3 4 5 6 7
no of customers 380 1120 1680 1780 1960 1530 1200 330
calculate the probability that a customers must wait before being facilitated?
Found 2 solutions by ikleyn, greenestamps:
Answer by ikleyn(52794) About Me  (Show Source):
You can put this solution on YOUR website!
.

Read your post attentively and think on what you read.

The probability is a fraction, whose denominator is the total number of customers,
while the numerator is the total number of customers minus 380.



Answer by greenestamps(13200) About Me  (Show Source):
You can put this solution on YOUR website!


"calculate the probability that a customers must wait before being facilitated"

Every customer needs to wait, even if it is only a fraction of a second. So the probability a customer must wait is 1.000.

ANSWER: 1

If the statement of the problem was supposed to say "...wait 5 or more minutes", then the question could be answered using the basic definition of probability:
                             number who wait 5, 6, or 7 minutes
P(wait 5 or more minutes) = ------------------------------------
                                        total number