probability help PLEASE
Find the probability that of 3 randomly selected customers:
1) exactly 2 will by diesel (out of diesel; 0.2, LRP; 0.15 and Unleaded, 0.65)
this has 6 different combinations, which i understand.
However, in a different question...
Rhys visits the supermarket every Saturday to do his weekly shopping. Items that he
may buy are milk, cheese and yogurt.
The probability, PðMÞ, that he buys milk on any given Saturday is 0.85 .
The probability, PðCÞ, that he buys cheese on any given Saturday is 0.60 .
The probability, PðYÞ, that he buys yogurt on any given Saturday is 0.55 .
The events M, C and Y may be assumed to be independent.
Calculate the probability that, on any given Saturday, Rhys buys:
(i) none of the 3 items; (2 marks)
(ii) exactly 2 of the 3 items. (3 marks)
you don't need to consider the different orders which they are bought. Why is this.
1) exactly 2 will by diesel (out of diesel; 0.2, LRP; 0.15 and Unleaded, 0.65)
this has 6 different combinations, which i understand.
However, in a different question...
Rhys visits the supermarket every Saturday to do his weekly shopping. Items that he
may buy are milk, cheese and yogurt.
The probability, PðMÞ, that he buys milk on any given Saturday is 0.85 .
The probability, PðCÞ, that he buys cheese on any given Saturday is 0.60 .
The probability, PðYÞ, that he buys yogurt on any given Saturday is 0.55 .
The events M, C and Y may be assumed to be independent.
Calculate the probability that, on any given Saturday, Rhys buys:
(i) none of the 3 items; (2 marks)
(ii) exactly 2 of the 3 items. (3 marks)
you don't need to consider the different orders which they are bought. Why is this.
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