Statistics: set 2
10 questions. Click an option: a correct answer turns green, a wrong one red, and an explanation appears.
Number of orders returned to an online shop over 8 days: 2, 4, 4, 4, 5, 5, 7, 9. Using the population formula (dividing by n), what is the standard deviation?
A barbershop's annual revenue rose from 120 mln soums to 150 mln soums. What is the absolute value of one percent of increase?
A fruit shop bought apples on two days: 120 000 soums' worth each day. On the first day a kilo cost 6 000 soums, on the second day 4 000 soums. What was the average price of one kilo of apples bought over the two days?
A small firm has 5 employees, with monthly salaries (mln soums) of 3, 3, 4, 4 and 36 (the manager). What are the arithmetic mean salary and the median?
A barbershop planned revenue of 80 mln soums for the month and actually earned 92 mln soums. What is the relative indicator of plan fulfillment?
Each month a cafe buys 100 loaves of bread (price rose from 4 000 to 4 400 soums) and 50 boxes of tea (price rose from 2 000 to 2 500 soums). What is the aggregate price index weighted by base-period quantities (Laspeyres formula)?
A bakery's revenue grew from 100 mln soums to 144 mln soums over two years. What is the average annual growth rate (by the geometric mean method)?
At a pharmacy, the share of card payments was 40% last month and reached 50% this month. What is the correct way to express this change?
A shop's monthly sales for January–June (mln soum): 10, 12, 17, 14, 13, 18. What is the three-month moving average for April–June?
A florist delivered the following numbers of orders over 5 days: 2, 4, 6, 8, 10. What is the mean absolute deviation (sum of absolute deviations / n)?