3 years ago

Hannah is making pancakes. She can make 3 pancakes in one minute. How many pancakes could she make in 1 hour?

Mathematics

1 answer:

SashulF [63]3 years ago

7 0

Answer:

180

Step-by-step explanation:

There are 60 minutes in one hour. Multiply 3 x 60 = 180.

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A real estate company is interested in the ages of home buyers. They examined the ages of thousands of home buyers and found tha

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Answer:

Between 21 years and 75 years

Step-by-step explanation:

Given that a real estate company is interested in the ages of home buyers. They examined the ages of thousands of home buyers and found that the mean age was 48 years old, with a standard deviation of 9 years.

X the ages of home buyers is N(48, 9)

a) $30\leq x\leq 66\\|x-48|\leq 18\\|x-48|\leq 2\sigma$

Hence using Cheby chev inequality

$P(|x-48|\leq 2\sigma)\geq 1-\frac{1}{2^2} \\=0.75$

b) $25.5\leq x\leq 70.5\\|x-48|\leq 22.5\\|x-48|\leq 1.5\sigma$

$P(|x-48|\leq 1.5\sigma)\geq 1-\frac{1}{1.5^2} \\=0.556$

c) Using normal distribution we have

$P(|x-48|\leq 2\sigma)=0.95$

d) z value is 2.97

Hence x lies between

$(48-9*2.97, 49+9*2.97)\\=(21.27,74.73)$

Between 21 years and 75 years

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Are the following two expressions equivalent? 7+7x ; 7 (x+ 1/7 )

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Step-by-step explanation:

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An airplane flies 3,080 km from Houston to New York at a speed of 770 km/h. How long did it take the plane to travel that distan

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time = distance/speed

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So it took 4 hours.

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