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Tentamen 11 December 2013, vragen en antwoorden
Business Research Methods for Pre-MSc (Rijksuniversiteit Groningen)
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Exam 11 December 2013
1) The average number of apples sold per day by a large supermarket is a uniformly
distributed random variable with a mean of 480. The distribution ranges from 300 to 660.
What is the probability that the supermarket sells more than 540 apples on a day?
A 0.3333
B 0.1587
C 0.1667
D 0.3174
660-540=120 660-300=360 120/360=0.3333
2) The manager of an ice cream shop has noticed that she occasionally runs out of ice cream.
She wants to stop this from happening, so she is calculating at which point she should start
making a new batch of 60 liters of ice cream to avoid running out. She wants to reduce the
number of instances where she has run out of ice cream to only 1% of all orders. She knows
that the amount of ice cream she sells during the time it takes to make new ice cream is
normally distributed with a mean of 30 liters and standard deviation of 4. Find the point
where the manager needs to start making new ice cream. The manager needs to start
making new ice cream when she has…
A 40.20 liters lef
B 36.58 liters lef
C 37.84 liters lef
D 39.32 liters lef
3) Research has shown that 17% of all office workers who work in windowless offices miss
days at work for health reasons. Out of all other office workers, 11% miss days at work for
health reasons. Which percentage of workers miss days at work for health reasons at a
company were 30% of all employees work in windowless offices?
A 5.1%
B 12.8%
C 14.4%
D 7.7%
17 % miss
30 %83 % do not miss =.30*.17
11 % miss
70 %89 % do not miss =.70*.11
.30*.17+.70*.11=0.128*100=12.8
5) If A and B are independent events with P(A)=0.30 and P(B) = 0.50, then P(B/A)=
A 0.15
B 0.30
C 0.50
D 0.80
1
Downloaded by Tim Groote ()
Tentamen 11 December 2013, vragen en antwoorden
Business Research Methods for Pre-MSc (Rijksuniversiteit Groningen)
StuDocu is not sponsored or endorsed by any college or university
Downloaded by Tim Groote ()
, lOMoARcPSD|2706935
Exam 11 December 2013
1) The average number of apples sold per day by a large supermarket is a uniformly
distributed random variable with a mean of 480. The distribution ranges from 300 to 660.
What is the probability that the supermarket sells more than 540 apples on a day?
A 0.3333
B 0.1587
C 0.1667
D 0.3174
660-540=120 660-300=360 120/360=0.3333
2) The manager of an ice cream shop has noticed that she occasionally runs out of ice cream.
She wants to stop this from happening, so she is calculating at which point she should start
making a new batch of 60 liters of ice cream to avoid running out. She wants to reduce the
number of instances where she has run out of ice cream to only 1% of all orders. She knows
that the amount of ice cream she sells during the time it takes to make new ice cream is
normally distributed with a mean of 30 liters and standard deviation of 4. Find the point
where the manager needs to start making new ice cream. The manager needs to start
making new ice cream when she has…
A 40.20 liters lef
B 36.58 liters lef
C 37.84 liters lef
D 39.32 liters lef
3) Research has shown that 17% of all office workers who work in windowless offices miss
days at work for health reasons. Out of all other office workers, 11% miss days at work for
health reasons. Which percentage of workers miss days at work for health reasons at a
company were 30% of all employees work in windowless offices?
A 5.1%
B 12.8%
C 14.4%
D 7.7%
17 % miss
30 %83 % do not miss =.30*.17
11 % miss
70 %89 % do not miss =.70*.11
.30*.17+.70*.11=0.128*100=12.8
5) If A and B are independent events with P(A)=0.30 and P(B) = 0.50, then P(B/A)=
A 0.15
B 0.30
C 0.50
D 0.80
1
Downloaded by Tim Groote ()
