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Math Problems STATS

  1. The US Safety Administration report on pedestrian injuries in traffic accidents found the following statistics:

30.6% of the cases the victim was under 16 years old, in 34.9% the accident occurred at night, and 6.3% the victim was under 16 and the accident occurred at night.

Round answers to the nearest 10th of a percent.

What is the probability that the victim was under 16 or the accident occurred at night?

%

What is the probability that the victim was 16 or older and the accident occurred during the day?

%

 

 

  1. There are 9 red rocks, 6 white rocks, and 7 blue rocks in a sack.

Write all answers to the nearest 10th of a percent.

What is the probability of selecting a rock that is red?

What is the probability of selecting one red rock or one white rock?

What is the probability of selecting a rock, putting it back, and selecting another that are both blue?

What is the probability of selecting a rock, putting it down, and selecting another that are both white?

What is the probability of selecting a rock that is red, putting it down, and selecting another that is white?

 

 

  1. Write each of these answers to 4 significant digits.  You can use Scientific Notation for the Answer.

For example:  your decimal answer is 0.0000230567, multiply by 100 to get percent….0.00230567.  The four significant digits are 2305, thus for normal answer:  0.002305%, and for Scientific:  2.305E-3%

 

The probability of winning a game  is 12.7% for each attempt.

What is the probability that you will not win the game (one attempt)?

%

What is the probability that you will win the game 4 times in a row?

%

What is the probability of loosing at least once out of 4 times of playing this game?

%

What is the probability of loosing 4 in a row?

%

What is the probability of winning at least once when the game is played 4 times in a row?

%

 

 

  1. What is the probability that the two back tires will pop in the next 5-years?

**

**Write answers in Scientific Notation, for example   0.0000025% = 2.5E-6%  (notice that it is negative 6).  Be careful to change percent to a decimal before calculation and take the answer and change it back to a percent.

What is the probability that a tire will not pop in 5-years?

Round to the nearest 100th of a percent.

What is the probability that none of the tires pop in the next 5-years?

Round to the nearest 100th of a percent.

What is the probability that at least one tire pops in the next 5-years?

Round to the nearest 100th of a percent.

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