The sum of two numbers is 39. The second number is 6 more than half of the first number. Let a represent the first number and le
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A suitable probability calculator will tell you that probabilty is about 25.9%.
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The normalcdf function on this calculator gives an area between a lower and upper limit. If the upper limit is more than about 8 standard deviations above the mean, the 10th decimal place is unaffected. Since the standard deviation here is about 5, we need to have an upper limit that is about 40 above the mean of about 30. We have chosen 80 as a nice round number and to give a little more margin.
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This is a incomplete quadratic equation, because it does not have the term bx. Therefore, we can solve this faster with the following strategy:
Add 16 to both sides:
Take the square root:
Therefore:
This is a incomplete quadratic equation, because it does not have the term bx. Therefore, we can solve this faster with the following strategy:
Add 16 to both sides:
Take the square root:
Therefore: