Mathematics (9-1) - 0980 CIE

Limits Of Accuracy

Gbogbo ọrọ náà

Every measurement is rounded, so the value you are given is never quite exact. Limits of accuracy tell you the range the true value could lie in. This matters whenever rounded measurements are added, subtracted or used in a calculation, because the small uncertainties combine.

In this lesson you will find the upper and lower bounds of a value rounded to a given accuracy, and (at Extended) find the bounds of the result of a calculation that uses rounded data.

Ebumnobi

  1. Give upper and lower bounds for data rounded to a specified accuracy.
  2. Find upper and lower bounds of the results of calculations which have used data rounded to a specified accuracy. (Extended only)

Nkuzi Olu

Gee ntị na nkuzi a na ngwa

Maapụ uche

E seela isiokwu a ka ị hụ otu echiche si ejikọta.

Mepee maapụ uche na ngwa

Kaadị ncheta

Omume ncheta ngwa ngwa n'ihe a na-anwale n'isiokwu a.

Mee omume kaadị ndị a na ngwa

Akwụkwọ Ọmụmụ

Knowing the bounds of a measurement tells you how much you can trust a result. Examiners test this directly, and it is the basis of error and tolerance in science and engineering.

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Nnyocha Ọmụmụ

Ekele diri gi maka imecha ihe karịrị na Limits Of Accuracy. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.

Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.

Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.

  1. A length is 24 cm to the nearest cm. What is its lower bound? A. 23 cm B. 23.5 cm C. 24.5 cm D. 25 cm Answer: B
  2. A length is 24 cm to the nearest cm. What is its upper bound? A. 24 cm B. 24.4 cm C. 24.5 cm D. 25 cm Answer: C
  3. A mass is 70 kg to the nearest 10 kg. What is its lower bound? A. 60 kg B. 65 kg C. 69.5 kg D. 75 kg Answer: B
  4. A time is 3.4 s to 1 decimal place. What is its upper bound? A. 3.405 s B. 3.41 s C. 3.45 s D. 3.5 s Answer: C
  5. A rectangle is 24 cm by 16 cm to the nearest cm. The upper bound of the perimeter is: A. 80 cm B. 81 cm C. 82 cm D. 84 cm Answer: C

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