1. The following frequency distribution of marks has mean 4.5. Mark 1 3 Frequency 2 6 (a) Find the value of x. 2+8+18 +36 +5x +54 +88 2+4+6+9rx+gey (b) Write down the standard deviation. 1.56 24 4 5 X 9 1465x 94 4x 6 6 7 4 = 1.5 146 +5x-153 +4.5 0.5x=7 x 14

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