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icang [17]
3 years ago
15

What is the answer of the equation -0.35+(-0.75+0.4)

Mathematics
1 answer:
Evgen [1.6K]3 years ago
8 0
In the order of operations, parentheses come before addition. 

-0.75 + 0.4 = -0.35

-0.35 + -0.35 = -0.7.

-0.35 + (-0.75 + 0.4) = -0.7

Hope this helps! Have an awesome day :)
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3. From the table below, find Prof. Xin expected value of lateness. (5 points) Lateness P(Lateness) On Time 4/5 1 Hour Late 1/10
wariber [46]

Answer:

The expected value of lateness \frac{7}{20} hours.

Step-by-step explanation:

The probability distribution of lateness is as follows:

  Lateness             P (Lateness)

  On Time                     4/5

1 Hour Late                  1/10

2 Hours Late                1/20

3 Hours Late                1/20​

The formula of expected value of a random variable is:

E(X)=\sum x\cdot P(X=x)

Compute the expected value of lateness as follows:

E(X)=\sum x\cdot P(X=x)

         =(0\times \frac{4}{5})+(1\times \frac{1}{10})+(2\times \frac{1}{20})+(3\times \frac{1}{20})\\\\=0+\frac{1}{10}+\frac{1}{10}+\frac{3}{20}\\\\=\frac{2+2+3}{20}\\\\=\frac{7}{20}

Thus, the expected value of lateness \frac{7}{20} hours.

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3 years ago
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