A random sample of 105 light bulbs had a mean life of 441 hours with a standard deviation of 40 hours. Construct a 90% confidence interval for the mean life, mu, of all light bulbs of this type.

What is the difference between a square and a rectangle? A) A square is a parallelogram and a rectangle is not. B) A square has 4 equal sides and a rectangle does not. C) A square has 4 right angles and a rectangle does not have to.

Firewood is often sold by the cord a cord of wood is a bundle measuring 4 feet by 4 feet by 8 feet. what's the volume of a cord of wood in cubic feet?

Is 5.73773777 ..., is it rational or irrational

Macy's buys a pair of Cole Haan dress shoes wholesale for $90. If Macy's marks up the price 20%, and tax is 9%, how much did Norman by the Cole Haan shoes from Macy's for?

0 = (2x - 3) (x + 1)

Let v=6i + 9j, and w = - i - 2j. Find 7w + 6v.

24.5 times 8.76 show work

You drive your car 4.5 hours at an average speed of 70 miles per hour. How far did you go

Rewrite the function by completing the square. g (x) = x2 + 152 + 54

Value of sin 440 degrees?