3 years ago

Evaluate the expression. (-4)2

Mathematics

2 answers:

Advocard [28]3 years ago

8 0

Answer:

-8

Step-by-step explanation:

4x2=8

change to negative since a negative times a positive is a negative

-8

lara31 [8.8K]3 years ago

6 0

Answer: -8

Step-by-step explanation: -4* 2= -8

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cricket20 [7]

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Step-by-step explanation:

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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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agasfer [191]

Answer:

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Step-by-step explanation:

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