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8090 [49]
3 years ago
5

What is the sum of two numbers a and b decreased by their product?

Mathematics
2 answers:
natka813 [3]3 years ago
8 0

Answer:

(a+b) - (ab)

Step-by-step explanation:

sum of two numbers a and b decreased by their product

(a+b) - (ab)

Oduvanchick [21]3 years ago
6 0

Answer:(a+b) - (ab)

Step-by-step explanation:


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Answer:

a) 0.1587

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Step-by-step explanation:

Let's start defining our random variable.

X : ''Thickness (in mm) of ancient prehistoric Native American pot shards discovered in a Hopi village''

X is modeled as a normal random variable.

X ~ N(μ,σ)

Where μ is the mean and σ is the standard deviation.

To calculate all the probabilities, we are going to normalize the random variable X.

We are going to call to the standard normal distribution ''Z''.

[(X - μ) / σ] ≅ Z

We normalize by subtracting the mean to X and then dividing by standard deviation.

We can find the values of probabilities for Z in a standard normal distribution table.

We are going to call Φ(A) to the normal standard cumulative distribution evaluated in a value ''A''

a)

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P(X>7)=P(\frac{X-4.5}{1.5}>\frac{7-4.5}{1.5})

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c)

P(3

P(-1 Φ(1.666) - Φ(-1) = 0.9525 - 0.1587 = 0.7938

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