81.Two dice are thrown. What is the probability that the sum of the two numbers obtained is greater than 10?
- A. 1/12
- B. 1/36
- C. 1/6
- D. 1/4
82.. If x and y are two real numbers such that 3x + 2y = 5 and 5x + 4y = 9, then 4x + 3y =
83.. If 35 is the median of the data set including 21, 7, 45, 33, 62 and x, then x =
84.The ....... is the value you calculate when you want the arithmetic average
- A. Mean
- B. Median
- C. Mode
- D. All of the above
85.The ..... is often the preferred measure of central tendency if the data are severely skewed
- A. Mean
- B. Median
- C. Mode
- D. Range
86.Which of the following is the formula for range?
- A. H + L
- B. L x H
- C. L – H
- D. H – L
87...... are used when you want to visually examine the relationship between two quantitative variables.
- A. Bar graphs
- B. a Pie graphs
- C. a Line graphs
- D. a Scatterplots
88.As a general rule, the is the best measure of central tendencybecause it is more precise
- A. Mean
- B. Median
- C. Mode
- D. Range
89.The most frequently occurring number in a set of values is called the .....
- A. Mean
- B. Median
- C. Mode
- D. Range
90.. A rectangular box with a square base and no top has a volume of 500 cm, the dimensions of the box that require the least amount of material are
- A. 10x10x5cm
- B. 4x5x25cm
- C. 50x5x2cm
- D. 25x10x2
91.The roof of a shelter is made from a piece of corrugated iron 2.3m long inclined at 18º to the horizontal. How far from the wall does the roof stick out?
- A. 0.7m
- B. 2.2m
- C. 1.1m
- D. 1.2m
92.A ladder 20m long rests against a vertical wall so that the foot of the ladder 9m from the wall. The height correct to 1 decimal place above the ground at which the upper end of the ladder touches the wall is
- A. 19.7m
- B. 18.1m
- C. 18.7m
- D. 17.9m
93.A chord 6.6m long is 5.6m from the centre of a circle. The radius of the circle is
- A. 3.2m
- B. 6.3m
- C. 6.5m
- D. 1.6m
94.The heights in cm, of 10 children are 145, 163, 159, 162, 167, 149, 150, 160, 170, and 155. The mean height of the children is
- A. 156cm
- B. 158cm
- C. 160cm
- D. 162cm
95.T The heights in cm, of 10 children are 145, 163, 159, 162, 167, 149, 150, 160, 170, and 155. The standard deviation of the heights of the children is
- A. 5.5cm
- B. 5.7cm
- C. 6.5cm
- D. 7.7cm
96.A class of all possible subsets of space S is called
- A. Universal set
- B. alpha - field
- C. sample space
- D. probability space
97.One of these is a demerit of a sample
- A. It is cheaper to enumerate a sample
- B. It is faster to survey a sample
- C. Results obtained from sample are oftentimes as informative as those from a censor
- D. None of the above
98.One of these is not a desirable feature of a good statistical table
- A. A table must reveal salient features of data
- B. A table must clearly communicate information in a neat and concise form
- C. A table must be self sufficient
- D. A table must be self explanatory
99.Which of these is a measure of location
- A. Mean
- B. Standard deviation
- C. Variance
- D. All of the above
100.Statistics is a set of tools whose proper use will …….. the decision maker
- A. Completely fill the needs of
- B. Encumber
- C. Aid
- D. Confuse