please help answer the question

The distribution of accuracy of impact locations from a very large number of impacts with Mjolnir (Thor's Hammer) was analyzed by a third-party insurance rm and found to be gaussian with a standard deviation in x and y directions of ox = 03, = 10 cm along a radius r from the intended impact point. If the radius from the intended impact point is 20 cm or greater Thor will miss the target, resulting in an even longer chain of improbable and completely unnecessary ght scenes, which will create further structural and environmental damage, thus increasing insurance payouts and resulting in insurance companies losing money. The insurance company wants to know: (a) What is the probability of Thor missing target? 0)) What is the probability of Thor hitting the target? (c) What is the expected value of r (the expected value of Thor's inaccuracy)? (d) What is the variance of r? (e) What would the standard deviation need to be to have the expected value of r = 0.1 cm