Question

The mass of a watch glass was measured four times. The masses were

Answer 1

Answer:

$\large \boxed{\text{100.005 g}}$

Explanation:

$\text{Average mass} = \dfrac{\text{Sum of all measurements}}{\text{Number of measurements}}$

1. Sum of Measurements

$\begin{array}{cr}\textbf{No.}& \textbf{Mass/g} \\1& 99.997 \\2& 100.008 \\3& 100.011 \\4& 100.005 \\\text{Sum } = & \mathbf{400.021}\\\end{array}$

2. Average mass

$\text{Average mass} = \dfrac{\text{400.021 g}}{4} = \textbf{100.005 g}\\\\\text{The average mass of the watch glass is \large \boxed{\textbf{100.005 g}} }$

Answer 2

To get the mass of the glass watch. It’s very simple. Take all 4 numbers 99.997, 100.008, 100.011, 100.005 add them together and then divide them by 4 bc there were 4 numbers to begin with.
The mass of the glass is- 100.00525 g