brettswain97 brettswain97
  • 16-02-2017
  • Mathematics
contestada

Check my steps and for part b, the professor wants us to show are work and I don't know how to solve it by hand.

Check my steps and for part b the professor wants us to show are work and I dont know how to solve it by hand class=

Respuesta :

wizard123
wizard123 wizard123
  • 16-02-2017
Part a is correct.

Part b can be done a couple ways.
1) Use binomial distribution. p = 0.2, n = 144
P(x>3) = 1 - P(x=0) -p(x=1) -p(x=2) -p(x=3)
where
[tex]P(x=k) = (nCk)p^k (1-p)^{n-k}[/tex]

2) Assume a normal distribution with mean = 28.2, stdev = 4.8
[tex]z = \frac{4 - 28.2}{4.8} = -5.04[/tex]
Look up z-value in normal table to find probability.

Hope that helps.
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