A histogram titled Greeting card sales has date on the x-axis and cards (millions) on the y-axis. January is 1 card, February: 11, March: 1, April: 1, May: 9, June: 7, July: 1, August: 1, September: 1, October: 9, November: 7, December: 12. The histogram shows the monthly sales for a greeting card company in one year. Which best describes the data for May–June and October–December? clusters no frequency gaps symmetry

What is a point-in-time measurement of system performance?

Suppose there is a relation r(a, b, c) with a b+-tree index with search keys (a, b).1. what is the worst-case cost of finding records satisfying 10 < a < 50 using this index, in terms of the number of records n1, retrieved and the height h of the tree? 2. what is the worst-case cost of finding records satisfying 10 < a < 50 and 5 < b < 10 using this index, in terms of the number of records n2 that satisfy this selection, as well as n1 and h defined above? 3. under what conditions on n1 and n2, would the index be an efficient way of finding records satisfying the condition from part (2)?

What are some examples of what can be changed through options available in the font dialog box? check all that apply. font family italicizing bolding pasting drop shadow cutting character spacing special symbols