Calculate the circumference of the following circles. Give your answers to 1 decimal place.

a) 31.4 cm b) 22.0 cm c) 9.4 mm d) 18.8 m e) 1.6 m f) 28.3 cm g) 78.5 cm h) 9.7 m

Step-by-step explanation:

All it really is multiply the diameter which is the straight line through the center of the circle

C = d × \pi

Step-by-step explanation:

Given that a soccer ball manufacturer wants to estimate the mean circumference of soccer balls within 0.1 inch.

a) sigma = 0.25

Since population std dev is known we can use Z critical value i.e. 2.58

Hence when sigma =0.25

we get n should be atleast = 41.6025 or 42

b) when sigma = 0.3 we get

n >59.390=60

c) Big std deviation requires larger sample size.