# Consider the experiment of flipping four fair coins. Suppose we are interested in the sum of total heads D.  What is the probability of obtaining one or more heads E.  What is the probability of obtaining less than three heads  Please do not solve using Microsoft Excel.  My professor is not teaching using excel.  I would like to see the steps taken to getting the solution for my own reference to study.

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Consider the experiment of flipping four fair coins. Suppose we are interested in the sum of total heads

D.  What is the probability of obtaining one or more heads

E.  What is the probability of obtaining less than three heads

Please do not solve using Microsoft Excel.  My professor is not teaching using excel.  I would like to see the steps taken to getting the solution for my own reference to study.

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Step 1

From the given information, four fair coins are tossed.

Let S be the sample space.

Step 2

D.The probability of obtaining one or more heads is,

Let X be the number of heads of a sum of four fair coins .

The required proba...

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