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Lyrx [107]
3 years ago
14

Explain how mental math can be used to estimate a 15% tip on a taxi ride that costs $23.25

Mathematics
2 answers:
sergiy2304 [10]3 years ago
6 0

Answer: 3.4875

Step-by-step explanation:

Here, According to the question,

Total amount is $23.25

100\% = 23.25

⇒1\% = \frac{23.25}{100}

⇒1\%= \frac{0.95}{8}

⇒ 15\%= 15\times \frac{0.95}{8} ( By multiplying 15 on both sides)

⇒ 15\%= \frac{14.25}{8}

⇒  15\%= 3.4875

Thus, 15% of $23.25 is $3.4875



fenix001 [56]3 years ago
3 0
10%=2.33 + half that is 1.17= 3.50 23.25×.15= 3.4875
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The probability that a call received by a certain switchboard will be a wrong number is 0.02. Use the Poisson distribution to ap
MAXImum [283]

Answer:

0.2008 = 20.08% probability that among 150 calls received by the switchboard, there are at least two wrong numbers.

Step-by-step explanation:

In a Poisson distribution, the probability that X represents the number of successes of a random variable is given by the following formula:

P(X = x) = \frac{e^{-\mu}*\mu^{x}}{(x)!}

In which

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e = 2.71828 is the Euler number

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The probability that a call received by a certain switchboard will be a wrong number is 0.02.

150 calls. So:

\mu = 150*0.02 = 3

Use the Poisson distribution to approximate the probability that among 150 calls received by the switchboard, there are at least two wrong numbers.

Either there are less than two calls from wrong numbers, or there are at least two calls from wrong numbers. The sum of the probabilities of these events is 1. So

P(X < 2) + P(X \geq 2) = 1

We want to find P(X \geq 2). So

P(X \geq 2) = 1 - P(X < 2)

In which

P(X < 2) = P(X = 0) + P(X = 1)

P(X = x) = \frac{e^{-\mu}*\mu^{x}}{(x)!}

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0.2008 = 20.08% probability that among 150 calls received by the switchboard, there are at least two wrong numbers.

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3 years ago
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