5. Determine the sample size needed to estimate the average weight of all second-grade boys if we want to be within 1 pound with 95% confidence. Assume we know that the standard
deviation of such weights is 3 pounds.

Aparallel system functions whenever at least one of its components works. consider a parallel system of n components, and suppose each component works independently with probability 0.5. find the conditional probability that component n works given that the system is working

Solve the system. -a+4b+2c=-8 3a+b-4c=9 b=-1 a.(0,11) ,-1,2) c.(1,1,-2) d.(2,-1,-1)

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