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  3. the army finds that the head sizes (forehead circu

The Army finds that the head sizes (forehead circumference) of soldiers has a normal distribution with...

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Basic Math

The Army finds that the head sizes (forehead circumference) ofsoldiers has a normal distribution with a mean of 22.7 inches and astandard deviation of 1.1 inches.

  1. Approximately 68% of soldiers have head sizes between (, )inches.
  2. Approximately 95% of soldiers have head sizes between (, )inches.
  3. Approximately 99.7% of soldiers have head sizes between (, )inches.

Answer & Explanation Solved by verified expert
3.9 Ratings (508 Votes)
Part a X N 227 11 P a X b 068 Dividing the area 068 in two parts we get 0682 034 since 05 area in normal curve is above and below the mean Area below the mean is a 05 034 Area above the mean is b 05 034 Looking for the probability 016 in standard normal table to    See Answer
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