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liubo4ka [24]
3 years ago
13

due in 5 minutes help! :( All CD’s are on sale for 20% this week. The CD is $9.99. What is the original price of the CD?

Mathematics
1 answer:
bekas [8.4K]3 years ago
6 0

Answer:

$12.49

Step-by-step explanation:

The price right now = 0.8 * the original price

9.99 = 0.8*x

x=12.4875

x≈12.49

Sorry, I thought your problem meant that it was 20% the original price, not 20% off.

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Answer:

a. Mean = 20

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b. Probability of X = 20 = 0.1960

Step-by-step explanation:

we have

n = 25

p = 80% = 0.8

mean = np

= 0.8 * 25

= 20

standard deviation = √np(1-p)

= √25*0.8(1-0.8)

=√4

= 2

probability that exactly 20 favours ban

it follows a binomial distribution

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= 53130 × 0.01153 × 0.00032

= 0.1960

Probability of X = 20 = 0.1960

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3 years ago
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8/9. hope this helped
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4x + y = 3
cestrela7 [59]

Answer:

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Step-by-step explanation:

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