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vaieri [72.5K]
3 years ago
11

The probabilities are 0.4, 0.2, 0.3 and 0.1, respectively, that a delegate to a certain convention arrived by air, bus, automobi

le, or train.
a. Consider 9 randomly selected delegates at this convention. What is the probability that from these 9 delegates, 3 arrived by air, 3 arrived by bus, 1 arrived by automobile, and 2 arrived by train?
b. Consider 9 randomly selected delegates at this convention. Suppose we are only interested in the delegates arriving by bus. What is the probability distribution of X: the number of delegates that arrived by bus?What is the probability that all 9 delegates arrived by bus?
c. Consider 9 randomly selected delegates at this convention. Suppose we are only interested in the delegates arriving by train. What is the probability distribution of X: the number of delegates that arrived by train? What is the expected value of the number of delegates that arrived by train?
d. Suppose now we are interested in delegates arriving by automobile. Suppose X represents the number of delegates that arrive until 5 have arrived by automobile. What is the distribution of X? What is the probability that exactly 10 delegates will arrive until 5 have arrived by automobile?
e. Suppose the delegates arrive at a rate of 3 delegates per hour. What is the probability that 5 delegates arrive over a two hour period?

Mathematics
1 answer:
Anika [276]3 years ago
5 0

Answer:

See solution solved accordingly

Step-by-step explanation:

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Answer:

The hikers are 5.9 miles apart.

Step-by-step explanation:

Let O represents the base camp,

Suppose after walking 3.5 miles west, first hiker's position is A, then after going 1.5 miles north from A his final position is B,

Similarly, after walking 2 miles east, second hiker's position is C then going towards 0.5 miles south his final position is D.

By making the diagram of this situation,

Let D' is the point in the line AB,

Such that, AD' = CD

In triangle BD'D,

BD' = AB + AD' = 1.5 + 0.5 = 2 miles,

DD' = AC = AO + OC = 3.5 + 2 = 5.5 miles,

By Pythagoras theorem,

BD^2 = BD'^2 + DD'^2

BD = \sqrt{2^2 + 5.5^2}=\sqrt{4+30.25}=\sqrt{34.25}\approx 5.9

Hence, the hikers are 5.9 miles apart.

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The tires on your bicycle have a radius of 8 inches. How many rotations does each tire make when you travel 700 feet? Round your
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"One rotation" would be the circumference of the wheel, which is

C = 2*pi*r, or  (here)  C = 2*pi*(8 inches) = 16*pi inches.

                                                                       1 ft
Convert this to feet:  16*pi inches  times  ---------------
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Here "inches" cancels out and you are left with (4/3)pi ft.

So, one rotation of the wheel moves you and your bike forward (4/3)pi ft.

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