Answer:
Probability of coin not land on island = 38.25 / 45
Explanation:
Given:
Length of rectangular fountain = 9 ft
Width of rectangular fountain = 5 ft
Side of square island = 1.5 ft
Number of island = 3
Find:
Probability of coin not land on island
Computation:
Area of fountain = 9 x 5
Area of fountain = 45 ft²
Area of three island = 3[Side²]
Area of three island = 3[1.5²]
Area of three island = 6.75 ft²
Probability of coin not land on island = [Area of fountain - Area of three island] / Area of fountain
Probability of coin not land on island = [45 - 6.75] / 45
Probability of coin not land on island = 38.25 / 45
Use your emergency brake immediately.
<h3>Answer:</h3>
<h3>Explanation:</h3>
In each case the expected value is the sum of products of value and its probability. (This is the definition of expected value.)
a) 1·0.3 +2·0.45 +3·0.05 +4·0.1 +5·0.1 = 2.25
b) 0·0.05 +1·0.15 +2·0.35 +3·0.25 +4·0.15 +5·0.05 = 2.45
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<em>Comment on the picture</em>
It is usually convenient to let a machine do the arithmetic, especially when the lists are long.
Here, you may notice there are only 5 contributors to the total for the second question. The first contributor for that question would be 0·0.05 = 0, so adds nothing to the total. Leaving it out makes the table sizes match, so makes the two problems easier to work with this calculator.