The mass of the object would be the mean which is 122.4, which must be rounded to three significant figures, i.e 122 g.
<h3>What is the unitary method?</h3>
The unitary method is a method for solving a problem by the first value of a single unit and then finding the value by multiplying the single value.
After measuring the mass of water,
the data is averaged and it is determined that the mean of 4 measurements is 122.4 g with a standard deviation of 1.3 g.
If the deviation is 1.3 g then, the true measurement will be
122.4g - 1.3g to 122.4g + 1.3g:
Lower limit: 122.4 g - 1.3 g
= 121.1 g
Upper limit: 122.4 g + 1.3 g
= 123.7 g
only the first two digits, hundreds and tens places, are certain.
The one digit is uncertain.
It should report the number with three significant figures:
2 certain digits + 1 uncertain digit.
The mass of the object would be the mean which is 122.4,
which must be rounded to three significant figures, i.e 122 g.
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