Probability problem

susumandrai

Junior Member
Joined
Feb 7, 2012
Messages
68
A six-sided die is weighted so that the probability of the numbers 1 to 6 facing upwards is as
shown in this table.
Uppermost number
1
2
3
4
5
6
Probability
2k
4k
3k
k
6k
4k

What is the probability that the number facing up is even or a multiple of 3?

Answer:
the value of k is 1/20 which is 0.05

P(Even or Multiple of 3) = P(Even) + (Multiple of 3)
= 9/20 + 7/20
= 16/20
= 0.8

I wonder why the textbook says 0.6
Please help...
 
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