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kramer
1 year ago
7

I don’t know how to do this

Mathematics
1 answer:
tigry1 [53]1 year ago
3 0

Answer:

5 ≥ x > 9

Step-by-step explanation:

x>9

5>=x

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A small airline overbooks flights on the assumption that several passengers will not show up. Suppose that the probability that
olchik [2.2K]

We have 22 tickets sold, and 20 seats. This means that at least 2 passengers must not show up (otherwise, at least 21 passengers will be present, and there wouldn't be space for them).

Considering each passenger as independent, you can think of this experiment. Suppose you toss a coin for each passenger. If the coin lands on heads, the passenger shows up. If it lands on tails, the passenger doesn't show up.

But the coin is unfair: it has a 0.91 probability of landing on heads, and thus 0.09 probability of landing on tails.

This implies that the probability of having exactly k tails is

\binom{22}{k} \cdot 0.09^k \cdot 0.91^{22-k}

We already concluded that at least two passengers must not show up. So, if our coins lands on tails less than twice, we've lost. So, the losing probability is

\displaystyle\binom{22}{0}\cdot 0.09^0 \cdot 0.91^{22} + \binom{22}{1}\cdot 0.09^1 \cdot 0.91^{21} \approx 0.39

Finally, remember the rule to negate events:

P(E) = 1-P(\lnot E)

So, if we lose with probability 0.39, we win with probability

1-0.39 = 0.61

6 0
3 years ago
X(1+y)+(7+7y) please factorise it with methods
nikklg [1K]

Answer:

x·(1 + y) + (7 + 7·y)

= x·(1 + y) + 7·(1 + y)

= (x + 7)·(1 + y)

4 0
3 years ago
What is 23% of 45 please show how you got it​
VMariaS [17]

Answer:

10.35

Step-by-step explanation:

23% is also means 0.23 so you just need to

0.23 * 45 = 10.35

pls brainiest

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I hope this helps you out :)
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