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3 years ago

The extra data costs are $20.99 monthly but they're offering 20% off that. What will my monthly cost be with the 20% off?

Mathematics

1 answer:

Alex787 [66]3 years ago

3 0

Answer:

Discounted price= $16.792

Step-by-step explanation:

Giving the following information:

The extra data costs are $20.99 monthly, but they're offering 20% off that.

To calculate the discounted price, we need to use the following formula:

Discounted price= normal price*(1 - discount rate)

Discounted price= 20.99*0.8

Discounted price= $16.792

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dmitriy555 [2]

Answer:

The expected value for the random variable is 14.16.

Step-by-step explanation:

We are given the following data below;

Z P(Z) $Z \times P(Z)$

9 0.16 1.44

12 0.25 3

15 0.36 5.4

18 0.17 3.06

21 0.06 1.26

Total 1 14.16

Now, the expected value for the random variable Z is given by;

E(Z) = $\sum Z \times P(Z)$

= $(9 \times 0.16) + (12 \times 0.25) +......+(21 \times 0.06)$

= 14.16.

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4 years ago

If the probability of an event is what is the probability of the event not happening?20/69Write your answer as a simplified frac

Vilka [71]

If an event has a probability P of happening, then there is a probability of (1-P) of the event not happening.

In this case the probability of the event is p=20/69.

Then, the probability of the event not happening is:

$P(\text{not happening})=1-p=1-\frac{20}{69}=\frac{69-20}{69}=\frac{49}{69}$

Answer: the probability of the event not happening is 49/69.

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1 year ago

Solve the equation 121x ²+64=0

slava [35]

Hello there ^ _ ^

121x² + 64 = 0
121x² = 0 - 64
121x² = -64
x² = 64/121
Now take square root
x = +/-√-64/121

I hope this help!

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