math !! measurement and errors

[匿名]

2013-09-23 8:08 pm

HELP ME TO ANSWER IT

1. Mary estimates that there are 130 candies in a bag , if the actual number of candies
is 126 find,
a)the absolute error,
b)the relative error,
c)the percentage error.

2.john is weighted to be 35.3 kg, correct to 3 significant figures,
a)what is the maximum absolute error,
b)what are the upper and lower limits of john's weight?
c) find the range of john's actual weight.
d)find the percentage error of his weight

PS: 1.要有步驟and the step must be detail
2. send the answer to [email protected] and type the answer here too

更新1:

你可唔可以寫D在一張紙上面，因為有D分數5清楚,and send to [email protected] again please thank you.

回答 (1)

Edwin

2013-09-23 8:40 pm

✔ 最佳答案

a)the absolute error：
130-126
=4
(the differences between actual value and approximate value)

b)the relative error：
4
____
126
1
=____
31.5
Absolute error
( ____________)
Actual value

c)the percentage error：
1
____ x 100%
31.5
47
=31_____ %
63
(relative error x100%)

2a)The maximum absolute error：
0.1 x 1/2
=0.05 kg

(1/2x scale interval of the measuring tool)

2b)
Upper limit：35.3+0.05=35.35kg
Lower limit：35.3-0.05=35.25kg

c)The range：
35.25kg≦actual value<35.35kg

d)The percentage error：

0.05
_____
35.3
1
=____ x 100%
706
50
=_____ %
353

Hope that I can help you

參考: 我

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