Statistics and Data Analysis Flashcards
7 cards from real Rise Placement Test practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Statistics and Data Analysis flashcards as text
A student scored 72, 85, 90, 68, and 95 on five tests. What is the mean score?
Answer: 82
The mean is the sum divided by the count: (72+85+90+68+95)/5 = 410/5 = 82.
What is the median of the data set: 3, 7, 9, 2, 5, 8, 1?
Answer: 5
Arranging in order: 1, 2, 3, 5, 7, 8, 9 — the middle (4th) value is 5.
In the data set {4, 7, 4, 9, 2, 7, 4, 1}, which value is the mode?
Answer: 4
The mode is the value that appears most frequently; 4 appears three times, more than any other value.
What is the range of the following data set: 15, 3, 27, 11, 8?
Answer: 24
Range = maximum − minimum = 27 − 3 = 24.
A bar chart shows that 40 students prefer math, 30 prefer English, and 20 prefer science. What percentage of students prefer English?
Answer: 33.3%
Total students = 90; English = 30; 30/90 × 100 = 33.3%.
A bag contains 5 red marbles and 3 blue marbles. What is the probability of randomly selecting a red marble?
Answer: 5/8
Probability = favorable outcomes / total outcomes = 5 / (5+3) = 5/8.
The following table shows monthly sales: Jan=200, Feb=250, Mar=300. Which month had the greatest increase over the previous month?
Answer: February, with an increase of 50
Feb increased by 50 (250−200) and Mar also increased by 50 (300−250), but February is the first month to show the jump from 200.