The freezing point (0) of water is measured four times. The results are 21, 13,

Question

The freezing point (0) of water is measured four times. The results are 21, 13, 14, and 6. Circle the statement that best describes this measuring process Accurate but not precise Precise but not accurate Neither accurate nor precise Both accurate and precise A laboratory sample of gas is known to have a true carbon monoxide (CO) concentration of 50 parts per million (ppm). A spectrophotometer is used to take three independent measurements of this concentration. The three measurements, in ppm, are 54, 53, and 55. Estimate the uncertainty in these measurements. (Use 1-decimal place)

Explanation / Answer

1) its neither precise nor accurate .

As there is a lot of difference in different readings .

2) uncertainty is calculated as follows :

53+54+55 = 162

162÷3 = 54

So uncertainty is (54-53)+(54-54)+(54-55) = 0

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