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Statistics Question

If a specimen is weighed 8 times on a scale.  σ = 0.001.  The average weight is 4.1602 grams.  A 99% confidence interval for the true weight of this specimen would be?

Statistic question?

If we have an SRS of 1600 students and the sample mean = 148.  Compare with an SRS of 900 students with the margin of error for a 95% confidence interval of µ is ?  the answer should be...

Roofing a home

  One roofing crew can finish a 2,800-sqaure-foot roof in 12 hours, and another crew can do the job in 10 hours. If they work together, can they finish before a predicted rain in 5 hours...

Probability

A slot machine has 3 wheels. Each wheel has 10 positions: a bar, and digits 0,1,2... When the handle is pulled the three wheels spin independently before coming to rest. Find the probability of:   Getting...

(2x^2-20xy+50y)

Factor each polynomial completely... I just don't get it. At all. I pay attention in class, but it just doesn't register in my mind. Please help me with the problem. 

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