3% Because if you would subtract the number of people that were invited and the number of people that only came, it would give you a total of 3% (hope that helped a little?)
Assuming the distribution is continuous, you have

If instead the distribution is discrete, the value will depend on how the interval of number between 1 and 29 are chosen - are they integers? evenly spaced rationals? etc
161/24 = 6.7
Hope this helps!
Step-by-step explanation:
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For a) simply substitute the speed of the car into the equation to get the braking distance.
For b) rearrange the equation to solve for x by substituting the braking distance in.
Rearranged, the equation looks like this: x = √(9d)
For c) use a calculator to find the precise value of x in question b.