The strength of the cubic concrete of the first line production is 110 N/mm² and standard deviation =12 N/mm² and for the second line production is 95 N/mm² and standard deviation =10 N/mm². If two samples are taken from each line, n=100X for each and the strength are tested, find the probability that the strength of 1 line greater than the 2nd line by: a- 17 N/mm² or more b- 35 N/mm² or more x=0.74

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