2 years ago

Write this mixed number in decimal form. three hundred forty-nine and eighty-seven hundredths

Mathematics

1 answer:

erica [24]2 years ago

4 0

It would be 349.87!! Hope this helped

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2. A random sample of 30 households was selected as part of a study on electricity usage, and the number of kilowatt-hours (kWh)

Brrunno [24]

Answer:

Step-by-step explanation:

Given that n =30, x bar = 375 and sigma = 81

Normal distribution is assumed and population std dev is known

Hence z critical values can be used.

For 95% Z critical=1.96

Margin of error = $1.96(\frac{81}{\sqrt{30} } )=29$

Confidence interval = 375±29

=(346,404)

B) 99% confidence

Margin of error = 2.59*Std error =38

Confidence interval = 375±38

=(337, 413)

C) For 90%

Margin of error = 20

Std error = 20/1.645 = 12.158

Sample size

$n=(\frac{81}{12.158} )^2\\=44.38$

Atleast 44 people should be sample size.

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2 years ago

tire and Jody's bedroom are shaped like rectangles Terrace bedroom is 9 ft long and 8 feet wide Jody's bedroom is 7 ft long and

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Terrace, because area= length (l) * width (w). Since terrace's room is 9 by 8, you multiply 9*8 which gives you 72ft squared. Jody's bedroom id 7*10 which gives you 70 ft squared. 72 is greater than 70.

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3 years ago

Which phrases below best describe the equation x - 240 = 91? (Select all)

nikdorinn [45]

Answer:

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2 years ago

Ratinal numbers are real numbers

tatuchka [14]

What's Ratinal? Do you mean rational? If so, you're right.

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hammer [34]

Answer:

what

Step-by-step explanation:

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