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s2008m [1.1K]
2 years ago
9

The distribution of the amount of money spent by students on textbooks in a semester is approximately normal in shape with a mea

n of 434 and a standard deviation of 31. According to the standard deviation rule, approximately 99.7% of the students spent between ____$ and ______$ on textbooks in a semester.
Mathematics
1 answer:
Firlakuza [10]2 years ago
6 0

Answer:

Hence, approximately 99.7% of students spend between : $341 and $527

Step-by-step explanation:

According to the empirical rule :

99.7% fall within 3 standard deviations from the mean

Given that :

Mean, μ = 434

Standard deviation, σ = 31

μ ± 3σ

μ - 3σ = 434 - 3(31) = 434 - 93 = 341

μ + 3σ = 434 + 3(31) = 434 + 93 = 527

Hence, approximately 99.7% of students spend between : $341 and $527 on textbooks in a semester.

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3 years ago
Brad bought a piece of industrial real estate for $192,345. The value of the real estate appreciated a constant rate per year. T
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Answer:

D. f(t) = 192,345(1.04)^t

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<em>I took the test and it was right. </em>

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3 years ago
ABC is an isosceles triangle in which ab and ac are equal if d is a the midpoint of BC prove that ABD=ADC​
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Answer:

Step-by-step explanation:

Given that,

ABC is an Isosceles triangle.

In an Isosceles triangle the opposite sides ( AB =AC) are equal; Their base angles ( < ABD = < ACD) are also equal to each other.

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Answer:

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