3 A technician tested a sample of 40 capacitors and recorded the capacitance values in a table. The capacitors had a nominal value of 50OnF each. 450 500 515 400 505 495 525 450 495 530 465 505 510 515 450 480 185 495 430 525 520 520 465 475 425 480 195 490 415 485 505 515 500 510 510 500 505 520 525 465 (3) Describe the meaning of a discrete variable. (b) Complete the frequency table for the grouped data. Capacitance C (nF) Tally Frequency (Number) Cumulative frequency 400 s C