exam Maths Puzzle Numerical Ability

A random sample of 56 fluorescent light bulbs has a mean life of 645 hours with a standard deviation of 31 hours. Construct a 95% confidence interval for the population mean.

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exam Other Question

15. Find the x-intercepts.

y=x^2-2x+4

x^2-2x+4=0

I then tried to factor however, there are no multiples of four that would equate to two. What am I not doing? s=-16t^2 + vt + so

v represents the initial velocity in ft/sec and so represents the initial height in feet.

a) If a rock is thrown upward with an initial velocity of 64 feet