exam Maths Puzzle Numerical Ability

3 0 0 4 0 I need to find a determinant of this, step by
6 -3 2 0 7 step, how it was found...
0 4 3 0 5
0 2 1 3 -4
6 0 -2

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exam Other Question

Thank you guys in advance your help is very much appreciated. I stumped on how to figure out the linear functun on this problem. Also I think I answered the rest of the problem cou calculate the missing frquency from the following distribution , it being given that the median of the distribution is 24.