Question 1196767
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I'll get you started on the first part of the question.


𝜇 = E(X) = <font color=red>6.66</font> is the expected value.
There were, on average, this many checkout lanes in a supermarket that was surveyed.


Work Shown:

<table border = "1" cellpadding = "5"><tr><td>X</td><td>P(X)</td><td>X*P(X)</td></tr><tr><td>1</td><td>0.01</td><td>0.01</td></tr><tr><td>2</td><td>0.02</td><td>0.04</td></tr><tr><td>3</td><td>0.02</td><td>0.06</td></tr><tr><td>4</td><td>0.1</td><td>0.4</td></tr><tr><td>5</td><td>0.1</td><td>0.5</td></tr><tr><td>6</td><td>0.15</td><td>0.9</td></tr><tr><td>7</td><td>0.25</td><td>1.75</td></tr><tr><td>8</td><td>0.2</td><td>1.6</td></tr><tr><td>9</td><td>0.1</td><td>0.9</td></tr><tr><td>10</td><td>0.05</td><td>0.5</td></tr><tr><td></td><td>Sum</td><td><font color=red>6.66</font></td></tr></table>
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