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Laabri

IM: 7.4.14: Percent Error (Lesson)

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Last updated over 1 year ago
13 Nsɛmmisa
14.1: Number Talk: Estimating a Percentage of a Number
14.2: Plants, Bicycles, and Crowds
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6.

Instructions to care for a plant say to water it with \frac{3}{4} cup of water every day. The plant has been getting 25% too much water. How much water has the plant been getting?

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7.

The pressure on a bicycle tire is 63 psi. This is 5% higher than what the manual says is the correct pressure. What is the correct pressure?

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14.3: Measuring in the Heat

Estimate.

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1.

25% of 15.8

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2.

9% of 38

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3.

1.2% of 127

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4.

0.53% of 6

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5.

0.06% of 202

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8.

The crowd at a sporting event is estimated to be 3,000 people. The exact attendance is 2,486 people. What is the percent error?

A micrometer is an instrument that can measure lengths to the nearest micron (a micron is a millionth of a meter). Would this instrument be useful for measuring any of the following things? If so, what would the largest percent error be?

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9.

The thickness of an eyelash, which is typically about 0.1 millimeters.

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10.

The diameter of a red blood cell, which is typically about 8 microns.

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11.

The diameter of a hydrogen atom, which is about 100 picometers (a picometer is a trillionth of a meter).

A metal measuring tape expands when the temperature goes above 50\degree F. For every degree Fahrenheit above 50, its length increases by 0.00064%.

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12.

The temperature is 100 degrees Fahrenheit. How much longer is a 30-foot measuring tape than its correct length?

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13.

What is the percent error?