1. The thickness (see Table below) of 40 spacing pieces were measured. Find a. Ef b. E (x f) (four significant digits) c. The mean - (four significant digits) Centre value Thickness (mm) (x) 30.30-30.32 30.33-30.35 Frequency (f) 1 1 2 3 3 30.36-30.38 30.39-30.41 30.42-30.44 30.45-30.47 30.48-30.50 6 4 13 10 7 2 Answer format: a,b.c

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