Q4: In the case of telescopes, we focus light from infinitely far away to make an image. One can think of each point of an image being made by the focusing of a separate beam. If we were
going to focus the light reflected by the moon on a screen using the lens in Q1-3, where should
we place the screen to make an in focus image? Explain your reasoning.

Avoltaic cell converts chemical energy to

Your science teacher brings in a speaker to talk to your class about climate change. during the session, students ask a few questions. which questions are related to the current evidence on climate change

7. see worksheet 1 for values of variables x1, x2 and x3 and answer the following questions: a. for each variable find the mean, median, coefficient of skewness, range and population standard deviation. b. compared to variable x1, how are the mean and median affected by extreme values (outliers) seen in x2 and x3. c. is the median or mean the better measure of location for x2 and x3? explain. d. explain the differences in the magnitudes of the skewness coefficients for the three variables. e. what is the relationship between the range and standard deviation looking across the three variables?