Two gunmen make two shots at a specific target, one shot each. the probability of hitting the target for the first gunman is 0.9.the probability of hitting the target for the second gunman is 0.3.both shots are independent events. letxbe the number of timesthe first gunman hits the target (xis 0 or 1) andybe thenumber of hits for the second gunman. letz=x−y.1. find the probability mass function for the random variablez2. find the expected valuee[z] and variancev[z].

15.2315345145 or 15.232

Step-by-step explanation:

step-by-step explanation:

if you want to solve percent error follow these steps.

1. subtract the accepted value from the experimental value.

2. take the absolute value of step 1.

3. divide that answer by the accepted value.

4. multiply that answer by 100 and add the % symbol to express the answer as a percentage.

if you want to solve percent of change just do this.

1. work out the difference (increase) between the two numbers you are comparing.

2. divide the increase by the original number and multiply the answer by 100. if your answer is a negative number then this is a percentage decrease.

hope this : )