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2 answers:
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Answer:
The answer is <u>A. 990.</u>
Step-by-step explanation:
Now, to find the greatest possible length of time any of the mowers operates.
The 3 lawn-service mowers operate at the average length of time = 930 minutes.
So, the total length of time the 3 lawn mowers take =
The least length a mowers operates = 900 minutes.
Now, to find the greatest possible length of time any of the mowers operates:
Let be the greatest possible length of time any of the mowers operates.
<em>As, any one of the mowers operates greatest length.</em>
<em>So, rest of the two mowers be least at length.</em>
According to question:
<em>Subtracting both sides by 1800 we get:</em>
<u><em>Thus, the greatest possible length of time any of the mowers operates is 990 minutes.</em></u>
Therefore, the answer is A. 990.
Answer:
a) There are 8 possible combinations and each probability is 1/8.
b) The probability that it is a boy given that there are two girls is 3/8
Step-by-step explanation:
a) The sample space is given by:
BBB (3 boys)
BBG (Boy, boy, girl)
BGB (Boy, girl, boy)
BGG (Boy, girl, girl)
GBB (girl, boy, boy)
GBG (girl, boy, girl)
GGB (girl, girl, boy)
GGG (3 girls)
The probability of each combination is the same:
P(BBB)=P(B∩B∩B)=
2) There are three possible combinations in which there are 2 girls and 1 boy:
BGG, GBG, GGB
So the probability is given by:
P(BGG ∪ GBG ∪ GGB)=