SOLUTION: A smart TV uses 120 watts of electricity per hour based on 7 hours of use per day. Assume the amount of electricity used measured is approximately normally distributed and the sta

Algebra ->  Probability-and-statistics -> SOLUTION: A smart TV uses 120 watts of electricity per hour based on 7 hours of use per day. Assume the amount of electricity used measured is approximately normally distributed and the sta      Log On


   

Question 1174439: A smart TV uses 120 watts of electricity per hour based on 7 hours of use per day. Assume
the amount of electricity used measured is approximately normally distributed and the standard deviation is 8. If 350 smart TV's are taken from the production line and tested, approximately how many will use more than 130 watts of power? (If you get a non-integer, round up and write that as the answer!)
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!

Hi
Normal Distribution:   μ = 120   σ = 8 
sample of 35
P(x>130) = P(x ≤ 130) = normalcdf(-9999, 130, 8, 120) = .89
  .89(35) = 31,  35-31 = 5  will use more than 130 watts of power
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