Calculating the mean when adding or subtracting a constant A professor gives a statistics exam. The exam has 100 possible points. The scores for the students in the second classroom are as follows:
44 92 88 56 96 88 56 80 72
Calculate the sample size, n, and the sample mean, M.
n =
M =
While grading the exam, the professor realizes that one of the questions covered material that was not yet covered in the lectures. This question was worth 8 points, so she decides to add 8 points to everyone’s score.
Calculate the new n and M.
n =
M =

An alpha particle with kinetic energy 12.5 mev makes a collision with lead nucleus, but it is not "aimed" at the center of the lead nucleus, and has an initial nonzero angular momentum (with respect to the stationary lead nucleus) of magnitude l = p0 b, where p0 is the magnitude of the initial momentum of the alpha particle and b=1.40×10−12 m. (assume that the lead nucleus remains stationary and that it may be treated as a point charge. the atomic number of lead is 82. the alpha particle is a helium nucleus, with atomic number 2.) what is the distance of closest approach?