Considering a standard normal distribution answer the following questions: A. A researcher grouped his data to include from two standard deviations (SD) below the median to one SD above the mean. Approximately what percentage of the total data was selected? B. What is the approximate percentage of a selected group that is above the 50 percentile and within two standard deviations of the mean?

14 pointslet x be the seats in the small van and y the seats in the large van. how many seats does the large van have? a company uses two vans to transport worker from a free parking lot to the workplace between 7: 00 and 9: 00a.m. one van has 9 more seats than the other. the smaller van makes two trips every morning while the larger one makes only one trip. the two vans can transport 69 people, maximum.how many seats does the larger van have?

Add the fractions, and simply the result to lowest terms. 2/3 + 2/7= ?

Solve this 364x-64x=300x and 12(x2–x–1)+13(x2–x–1)=25(x2–x–1)