The editor of the video Gamer is selecting 7 video games from 13 possibilities to review in his online column. one will be the featured game and the other 6 will be covered in less detail and in no particular order. In how many ways can he make his selection

Describe in detail how you would construct a 95% confidence interval for a set of 30 data points whose mean is 20 and population standard deviation is 3. be sure to show that you know the formula and how to plug into it. also, clearly state the margin of error.

Use the frequency distribution, which shows the number of american voters (in millions) according to age, to find the probability that a voter chosen at random is in the 18 to 20 years old age range. ages frequency 18 to 20 5.9 21 to 24 7.7 25 to 34 20.4 35 to 44 25.1 45 to 64 54.4 65 and over 27.7 the probability that a voter chosen at random is in the 18 to 20 years old age range is nothing. (round to three decimal places as needed.)

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.