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1 year ago

Please help me asap with number 20 and explain please

Mathematics

1 answer:

kow [346]1 year ago

6 0

Answer:

Step-by-step explanation:

because it is increasing exponentially

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What is a parralel line

Kryger [21]

Answer:

A parallel line is something that is equivalent on the other end. This mean if you cut a shape, a square for example, in half,the sides will be of equal length.

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1 year ago

Read 2 more answers

Order least to greatest. 7/9, 32/45, 20/27, 2/3

Rufina [12.5K]

2/3, 32/45, 20/27, 7/9

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2 years ago

An certain brand of upright freezer is available in three different rated capacities: 16 ft3, 18 ft3, and 20 ft3. Let X = the ra

ruslelena [56]

Answer:

$E(X)=16\cdot 0.3+18\cdot 0.1+20\cdot 0.6=18.6$

$E(X^2)=16^2\cdot 0.3+18^2\cdot 0.1+20^2\cdot 0.6=349.2$

$V(X) = E(X^2)-[E(X)]^2=349.2-(18.6)^2=3.24$

The expected price paid by the next customer to buy a freezer is $466

Step-by-step explanation:

From the information given we know the probability mass function (pmf) of random variable X.

$\left|\begin{array}{c|ccc}x&16&18&20\\p(x)&0.3&0.1&0.6\end{array}\right|$

Point a:

The Expected value or the mean value of X with set of possible values D, denoted by E(X) or μ is

$E(X) = $\sum_{x\in D} x\cdot p(x)$

Therefore

$E(X)=16\cdot 0.3+18\cdot 0.1+20\cdot 0.6=18.6$

If the random variable X has a set of possible values D and a probability mass function, then the expected value of any function h(X), denoted by E[h(X)] is computed by

$E[h(X)] = $\sum_{D} h(x)\cdot p(x)$

So $h(X) = X^2$ and

$E[h(X)] = $\sum_{D} h(x)\cdot p(x)\\E[X^2]=$\sum_{D}x^2\cdot p(x)\\ E(X^2)=16^2\cdot 0.3+18^2\cdot 0.1+20^2\cdot 0.6\\E(X^2)=349.2$

The variance of X, denoted by V(X), is

$V(X) = $\sum_{D}E[(X-\mu)^2]=E(X^2)-[E(X)]^2$

Therefore

$V(X) = E(X^2)-[E(X)]^2\\V(X)=349.2-(18.6)^2\\V(X)=3.24$

Point b:

We know that the price of a freezer having capacity X is 60X − 650, to find the expected price paid by the next customer to buy a freezer you need to:

From the rules of expected value this proposition is true:

$E(aX+b)=a\cdot E(x)+b$

We have a = 60, b = -650, and E(X) = 18.6. Therefore

The expected price paid by the next customer is

$60\cdot E(X)-650=60\cdot 18.6-650=466$

4 0

2 years ago

Explain how you can determine the sign of an integer quotient without dividing.

umka2103 [35]

Use multiplication. Say you need to divide 56 by 8. You'd attempt to find the multiples of 8 and find the clear answer of when 56 comes around. It obviously wouldn't be 1, because that's 8.. nor would it be 2, 3, 4, or 5.. so that's where the actual multiplication and finding the number starts. You need to try multiple numbers in order to find the answer. The answer would be 7. See, you just found out the answer without even dividing. :))))

6 0

2 years ago

HELP ME PLS!!!!! ASAPPPPPPPP

Serjik [45]

The anwser you are looking for is 17

8 0

2 years ago