Answer:
See explanation below
Step-by-step explanation:
Since each time after the person gets off the scale, the reading is 2 lb the person's weight must be near the mean of
148-2, 151-2, 150-2, 152-2; that is to say, near the mean of 146, 149, 148, 150 = (146+149+148+150)/4 = 148.25
We could estimate the uncertainty as the standard error SE
[tex]\bf SE=\frac{s}{\sqrt{n}}[/tex]
where
s = standard deviation of the sample
n = 4 sample size.
Computing s:
[tex]\bf s=\sqrt{\frac{(146-148.25)^2+(149-148.25)^2+(148-148.25)^2+(150-148.25)^2}{4}}=1.479[/tex]
So, the uncertainty is 1.479/2 = 0.736
It is not possible to estimate the bias, since it is the difference between the true weight and the mean, but we do not know the true weight.
