Answer:
The minimum width of the book = 20.9 cm
Explanation:
The length of the book cover = 28.3 cm
The width of the book cover = 21 cm
Given that the uncertainty in measurement should be included due to the likelihood of error in measurement, the uncertainty in measurement can be presented as follows;
Measurement = (Best estimate + Uncertainty) units
Whereby the display of the measuring device is limited to one decimal place, we can have the measurement of the width, w, as follows;
Width of the book = (21 ± 0.1) cm
The range of the width of the book is therefore 20.9 cm to 21.1 cm
The minimum width of the book = 20. cm