1. A student's weight displayed on a digital scale is 117.2 lb.

This would suggest her weight is

(a) Within 1% of 117.2 lb.

(b) Exactly 117.2 lb.

(c) Somewhere between 117.18 and 117.22 lb.

(d) Somewhere between 117.0 and 117.4 lb.

2. Four students use different instruments to measure the length of the same pen. Which measurement implies the greatest precision?

(a) 160.0mm.

(b) 16.0 cm.

(c) 0.160 m.

(d) 0.00016 km.

(e) Need more information.

3. The number 0.0078 has how many significant figures?

(a) 1.

(b) 2.

(c) 3.

(d) 4.

4. How many significant figures does 1.362 + 25.2 have? Choose the correct option from the following options:

(a) 2.

(b) 3.

(c) 4.

(d) 5.