Answer:
99.8%
Step-by-step explanation:
Normal Distribution
Standard deviation σ
mean equal to 175 pounds
We should remember approximately values for intervals:
[μ - σ/2 : μ + σ/2] values spread 1σ up and down mean equal to 68.3 %
[μ - σ : μ + σ ] values spread 2σ up and down mean equal to 95.7 %
and finally
[μ - 1.5 σ : μ + 1.5 σ ] values spread 3σ up and down mean equal to 99.7
In our case we were asked porcentage between 4σ (40 kg) spread about mean
175 + 40 = 215
175 - 40 = 135
For that interval we should get 99.8% of values
Median is 6 so your answer is C
you have to make sure that they have the same denominator so
31/4 -4 2/4
= - 1 1/4
hope this helped you hon
