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IM: 7.4.14: Percent Error (Lesson)

Last updated 9 months ago
13 questions
14.1: Number Talk: Estimating a Percentage of a Number
Estimate.
1

25% of 15.8

1

9% of 38

1

1.2% of 127

1

0.53% of 6

1

0.06% of 202

14.2: Plants, Bicycles, and Crowds
1

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?

1

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?

1

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?
1

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

1

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

1

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

14.3: Measuring in the Heat
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%.
1

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

1

What is the percent error?