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malfutka [58]
3 years ago
7

Can someone help me with all of these

Mathematics
1 answer:
vazorg [7]3 years ago
6 0
7. = 29/9 0.6 terminating
8. = 301/20 0.75 terminating

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A car dealership sells 0, 1, or 2 luxury cars on any day. When selling a car, the dealer also tries to persuade the customer to
melisa1 [442]

Answer:

Mean = 1.42

Variance = 0.58

Step-by-step explanation:

Given: X denote the number of luxury cars sold in a given day, and Y denote the number of extended warranties sold.

Also, joint probability function of X and Y are given.

To find:

mean and variance of X

Solution:

From the given joint probability function of X and Y,

P(X=0)=\frac{1}{6}\\P(X=1)=\frac{1}{12}+\frac{1}{6}=\frac{1+2}{12}=\frac{3}{12}\\P(X=2)=\frac{1}{12}+\frac{1}{3}+\frac{1}{6}=\frac{1+4+2}{12}=\frac{7}{12}

Mean of X:

E(X)=\sum XP(X)\\=0\left ( \frac{1}{6} \right )+1\left ( \frac{3}{12} \right )+2\left ( \frac{7}{12} \right )\\=0+\frac{3}{12}+\frac{14}{12}\\=\frac{17}{12}=1.42

Variance of X:

E(X^2)=\sum X^2P(X)\\=0^2\left ( \frac{1}{6} \right )+1^2\left ( \frac{3}{12} \right )+2^2\left ( \frac{7}{12} \right )\\=0+\frac{3}{12}+\frac{28}{12}\\=\frac{31}{12}

var(X)=E\left [ X^2 \right ]-\left ( E\left [ X \right ] \right )^2\\=\frac{31}{12}-\left ( \frac{17}{12} \right )^2\\=\frac{31}{12}-\frac{289}{144}\\=\frac{372-289}{144}\\=\frac{83}{144}\\=0.58

5 0
3 years ago
What is this equation? Solve for X-2/7=5/7
Anna [14]
<span>x−<span>2/7</span></span>=<span>5/<span>7
so this means x = 1</span></span>
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The answer is never
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Lapatulllka [165]

Step-by-step explanation:

according to the question

55x⁶+22x⁴

11x⁴(5x²+2)

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width:11x⁴

length:5x²+2

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HELP FAST!!!!<br><br> Name the 3 ways you can find a sample space for compound events.
ANTONII [103]
There are three ways to create a sample space for a compound event.

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