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spayn [35]
3 years ago
8

PLEASE HELP! Two years ago a man was six times as old as his daughter. In 18 years he will be twice as old as his daughter. Dete

rmine their present ages.
Mathematics
1 answer:
ikadub [295]3 years ago
8 0
The Man is 58.
The daughter is 25.
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valina [46]

Answer:

The answer is below

Step-by-step explanation:

The z score is used to determine by how many standard deviations the raw score is above or below the mean. The z score is given as:

z=\frac{x-\mu}{\sigma}\\\\where\ x=raw\ score,\mu=mean\ and\ \sigma=standard\ deviation \\\\For\ a\ sample\ size\ n: \\\\z=\frac{x-\mu}{\sigma/\sqrt{n} }

Given that μ = $72,641 and σ = $30,000.

a) x > $100000

z=\frac{100000-72641}{30000}=0.91

P(x > 100000) = P(z > 0.91) = 1 - 0.8186 = 0.1814

b) n = 5

x > $100000

z=\frac{100000-72641}{30000/\sqrt{5} }=2.04

P(x > 100000) = P(z > 2.04) = 1 - 0.9793 = 0.0207

c) n = 10

x > $100000

z=\frac{100000-72641}{30000/\sqrt{10} }=2.88

P(x > 100000) = P(z > 2.88) = 1 - 0.9980 = 0.002

4 0
2 years ago
Find the percent change from the first value to the second 50;30
Alex787 [66]

Answer:

-40%

Step-by-step explanation:

NV = new value

OV = old value

percent change = (NV - OV)/(OV) × 100%

percent change = (30 - 50)/(50) × 100%

percent change = -20/50 × 100%

percent change = -40%

5 0
1 year ago
The temperature in Baku, Azerbaijan dropped over five hours from zero degrees Fahrenheit to negative fifteen degrees Fahrenheit.
e-lub [12.9K]

Answer:

its either 3 or -3 hopefully someone in the comments can tell which

Step-by-step explanation:

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3 years ago
A car dealership offers a special interest rate of 3.5%. What is 3.5% written as a decimal? A. 0.0035 B. 0.035 C. 0.35 D. 35.0
wel
Make 3.5% out of 100: \frac{3.5}{100} 3.5÷100=0.035. So the Answer is B. 0.035.
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vodka [1.7K]
It's would be plus haft that number (it's a negative) and the next number would be 0
3 0
3 years ago
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