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AveGali [126]
3 years ago
6

The mean value of land and buildings per acre from a sample of farms is ​$1300​, with a standard deviation of ​$200. The data se

t has a​ bell-shaped distribution. Assume the number of farms in the sample is 74.
​(a) Use the empirical rule to estimate the number of farms whose land and building values per acre are between ​$1100 and ​$1500.

Mathematics
1 answer:
Whitepunk [10]3 years ago
4 0

Answer:

number of farms are 108

Step-by-step explanation:

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grandymaker [24]

Answer: One DVD is $12 and one book is $1

Step-by-step explanation:

Let the DVD be d and the book be b.

Case 1:

3d + 4b = $40.......(1)

Case 2:

1d + 6b = $18........... (2)

In this equations above, I intend to eliminate variable d, so I'm going to multiply the coefficient of d in (1) to multiply (2)

3 × (1d + 6b = 18)

3d + 18b = 54........ .(3)

Then, subtract (1) from (3)

3d + 18b = 54

- ( 3d + 4b = 40)

3d - 3d + 18b - 4b = 54 - 40

0 + 14b = 14

b = 14/14

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Then substitute 1 for b in (2)

1d + 6(1) = 18

d + 6 = 18

d = 18 - 6

d = 12.

(d,b) = (12,1)

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3 years ago
9.51 as a mixed number in a simplest form
Triss [41]

Answer:

Below

Step-by-step explanation:

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