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Why sometime the other half of my body felt weaker? How was the cov( X(s), X(t)) obtained. i know that E[x(s)] * E[x(t)] = 0 but i don't know how to calculate E[x(s) x(t)]? If i found 35 quarters and dimes worth $6.50 how many of each do I have? Hai sign in to kacokaco? Given that x is a normal variable with mean μ = 49 and standard deviation σ = 7.1, find the following probabilities. P(x ≤ 60)?