Question

The table shows the number of minutes customers waited in line at a bank during the lunch hour, and the corresponding frequencies.
Minutes spent
waiting Frequency
1 3
2 10
3 2
4 1
5 4
6 or more 7
Find the probability of each event. (Round your answers to the nearest percent.)
(a) A customer waited 4 minutes.
%

(b) A customer waited 3 or 4 minutes.
%

(c) A customer waited less than 4 minutes.
%

(d) A customer waited 5 or more minutes.
%

Answer 1

P(A) = The Number Of Ways Event A Can Occur
-----------------------------------
The total number Of Possible Outcomes

Answer 2

For parts a,b,c and d your denominator will be the same. What is your denominator?

Answer 3

6

Answer 4

No your denominator for each part is just the total number of customer, so you have to add up 3+10+2+1+4+7

Answer 5

27

Answer 6

right. now lets look at part a. how many customers waited 4 minutes? That 's your numerator for part a.

Answer 7

so 4/27= 0.14 or 14%?

Answer 8

no. only 1 customer waited 4 minutes
1/27 = 0.04 or 4%

Answer 9

1 customer out of 27 customers waited 4 minutes. make sense?

Answer 10

yes, this makes sense.

Answer 11

how many customers waited 3 or 4 minutes?

Answer 12

3, so 3/27= 11% correct?

Answer 13

right!

Answer 14

So, to determine how many students waited less than 4 minutes, do I use the numbers for 4 minutes and down or start at 3?

Answer 15

Im confused with that one

Answer 16

just 3 + 10 + 2

Answer 17

so 15/27?

Answer 18

15/27=55% correct? or is it rounded to 56%?

Answer 19

round up since the next digit after the 2nd 5 is a 5
0.55555555 rounds to 0.56 or 56%

Answer 20

okay

Answer 21

for 5 or more minutes use 7+4 .correct?

Answer 22

and that would be 11/27 = 41%