Answer:
(a) 0.139258
(b) 0.0064827
Step-by-step explanation:
Let the probability that each member makes a correct decision be and the probability that each member makes an incorrect decision be .
From the question,
p and q are mutually exclusive. Hence,
(a) For majority rule, it means at least 4 members decisions are taken. Taking "C" to mean "correct" and "I" to mean "incorrect", we could have 4C against 3I, 5C against 2I, 6C against 1I and 7C against 0I.
The probability of the correct decision being made is
(b)
The best thing to do here is to put each of these into fractions, with the total (31) as the denominator.
14/31= silver
6/31= black
8/31= copper
3/31= various colours.
As you're looking for the keys that are silver or copper, you've got to add the two denominators together, which gives you 14+8= 22.
This cannot be simplified further, therefore, the probability of choosing either a silver or copper key is 22/31
Hope this helps :)
Answer:
5. 20
6. 30
7. 22
Step-by-step explanation:
5. The median is indicated by the line (and dot) in the middle of the box.
6. The maximum value is indicated by the extreme right end of the whisker.
7, The upper quartile is indicated by the right end of the box.
Answer:
answer is 10
Step-by-step explanation:
a+c+b+c=55
-x/2+3/2<5/2
x+13=25 x+13-13=25-13