find the percent of change. round to the 8/40=x/100 20% ...€¦ · 18/10/2019 · do now: find...
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7 Percent Error
1
Do Now: Find the percent of change. Round to the nearest tenth if necessary. State whether it is a percent increase or decrease.
1. From $40 to $32
2. From 56 inches to 63 inches
Find the percent of change. Round to the nearest tenth if necessary. State whether it is a percent increase or decrease.
1. From $40 to $32
2. From 56 inches to 63 inches 8/40=x/100 20% decrease
9/56=x/100 12.5% increase
400/1300=x/100
30.8% decrease
7 Percent Error
2
TB pg 244 # 117 odd
7 Percent Error
3
Percent Error
_____% of _______ is _________actual amount of error
actual - the "real" amountamount of error - the difference between the prediction or estimate and the actual amount.
Find the percent error.1. estimated distance: 60 miles
actual distance: 75 miles
2. measured are: 24 square inches
actual area: 22.5 square inches
7 Percent Error
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Find the percent error.1. estimated distance: 60 miles
actual distance: 75 miles
2. measured are: 24 square inches
actual area: 22.5 square inches
15/75=x/100 20% underestimated
1.5/22.5=x/100 6.7% overestimated
The estimate for the amount of rain in May in one part of Texas was 5.6 inches. the actual rainfall was 2.4 inches. What was the percent error of the estimate to the nearest percent?
7 Percent Error
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The estimate for the amount of rain in May in one part of Texas was 5.6 inches. The actual rainfall was 2.4 inches. What was the percent error of the estimate to the nearest percent?
3.2/2.4=x/100
133.3% overestimated
1. Alyssa estimates that her school auditorium has 660 seats. It actually has 750 seats. What is the percent error of her estimate?
Answer on next slide
7 Percent Error
6
1. Alyssa estimates that her school auditorium has 660 seats. It actually has 750 seats. What is the percent error of her estimate?
amt. of erroractual
750 - 660750 = 90
750= 0.12 x 100
= 12% error (underestimated)
2. A company replaced a half gallon container of orange juice with a 59 ounce container. If a customer does not notice the change in size, what is the percent error to the nearest tenth?
Answer on next slide
HINT: 1 gal = 128 oz
7 Percent Error
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2. A company replaced a half gallon container of orange juice with a 59 ounce container. If a customer does not notice the change in size, what is the percent error to the nearest tenth?
amt. of erroractual
***Before you can solve this problem, the units must be the same.1 gallon = 128 ounces
0.5 gallon = 64 ounces
64 - 5964
5 64
= = 0.078
0.078 x 100 = 7.8%(underestimated)
3. The estimate for the amount of rain in May in one part of Texas was 5.6 inches. The actual rainfall was 2.4 inches. What was the percent error of the estimate to the nearest percent?
7 Percent Error
8
3. The estimate for the amount of rain in May in one part of Texas was 5.6 inches. The actual rainfall was 2.4 inches. What was the percent error of the estimate to the nearest percent?
(overestimated)
amt. of erroractual
5.6 - 2.42.4
= 3.22.4
= 1.33
1.33 x 100 = 133%
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