a photograph that measures 20 cm by 15 cm is enlarged so that its length becomes 28 cm. what does the width become?
2 answers:
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Answer:
Step-by-step explanation:
Given that an automatic machine is set to fill bags of dog food with exactly 25 pounds on average with a standard deviation of 0.5 pounds.
Sample size = n =100
x bar = 24.85 pounds
Sample std error =
Hypotheses:
(Two tailed test at 5% level)
Mean difference =0.15
Test statistic = mean diff/se = 3
Since population std dev is known z test can be used
p value =0.0000
Since p <0.05 we find that the bag does not contain exactly 25 pounds.
We know that area of the square is 141 square feet. Therefore, we can figure out the dimension of square using formula for area as shown below:
We know that fencing is used along the sides of the square. Therefore, amount of fencing required will be equal to perimeter of square.
Hence, we can write:
Upon rounding to nearest foot, we get the amount of fencing required as 48 feet.