The diameter of a spherical bob, when measured with vernier callipers yielded the following values: 3. 33 cm,3. 32 cm,3. 34 cm,3. 33 cm and 3. 32 cm. The mean diameter to appropriate significant figures is:
a. 3. 328 cm
b. 3. 3 cm
c. 3. 33 cm
d. 3. 32 cm