The radial distance to impact points for shells fired by a cannon is approximate

Question

The radial distance to impact points for shells fired by a cannon is approximated by a normal Gaussian random variable with a mean of 200 m and standard deviation 40 m. When a target is located at 1980 m distance the probability that shells will fall within plusminus 68 m of the target is: The chance of a car being stolen from a residential area is 1 in 120. In one area there are five cars parked in front of the houses. The probability that none will be stolen is: The standard deviation of the sequence 3, 4, 4, 5, 8, 8, 8, 10, 11, 15, 18, 20 is : Weighted arithemetic mean of the following 50 data points is:

Explanation / Answer

3.37

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