Two groups of students (80 each) are selected randomly from a department. they are asked to test the ph value of a compound. x and y are the random variables that represent the results from the 2 groups. they are independent and follows the same unknown distribution, with known expectations of 5 and variances of 0.3. 7gbt3whkcetlqmsuvork5cyii= and oaarmma+hnkp6bjru5erkjggg== are the means of results from the 2 groups, respectively. find the probability that the difference between the means of the 2 groups is not greater than 0.1.