A Binomial random variable has a mean equal to 5 and a standard deviation of 2. So, theprobability of success in single trial, p = 0.8

True

False

The length of time of a particular phone call is an example of continuous random variable.

True

False

The Expected value of the random variable X where its values are 2, 3, 4 and the corresponding

probabilities are 0.3, 0.3, 0.4 respectively, is equal to

5.1

3.1

4.1

2.1

A company is studying the number of monthly absences among its 100 employees. The

following probability distribution shows the likelihood that people were absent 0, 1, 2, 3 or 4

days last month:

No. of days absent

0

1

2

3

4

Probability

0.50

0.10

0.20

0.20

0.00

What is the mean number of days an employee has been absent?

0.40

0.60

1.00

1.10

The random variable X has the following probability distribution.

x

0

1

2

3

P(x)

0.2

0.3

k

0.4

The value of k is

0

0.01

0.1

1.0

The following is a frequency distribution table for the kids ages in a nursery:

Age (Months)

0 – 11

12 – 23

24 – 35

Midpoint Frequency

9

5.5

17

17.5

14

29.5

The mean kids’ age in this nursery is 13.33.

True

False

The following are the grades of 20 students in STAT101. The percentile of the grade 90 is 80

54

60

60

62

66

67

68

69

70

73

74

74

77

82

84

88

90

91

95

97

True

False

Speed of train is an example of

Continuous Data

Discrete Data

Categorical Data

Qualitative Data

If A and B are mutually exclusive events, then

P(A or B) = 0

P(A or B) = P(A).P(B)

P(A or B) = P(A)/P(B)

P(A or B) = P(A) + P(B)

A survey of a sample of undergraduate students in the faculty of Science in a university revealed

the following regarding the gender and majors of the students:

Gender

Total

Major

Statistics

Physics

Mathematics

Male

20

12

8

40

Female

2

6

2

10

Total

22

18

10

50

A student is randomly selected, the probability of selecting a physics major, given that the

student selected is Female is equal to

6/50

6/10

10/40

8/40

The probability of drawing any one spade card from a pack of 52 cards is

4/13

1/4

1/13

1/52

If the relative frequencies of class-intervals of a distribution are 0.20, 0.10, x, 0.25 & 0.15. Then

the value of the missing value x is

0.15

0.20

0.25

0.30

•

•

Question 13 of 25

Moving to another question will save this response.

Question 13

The frequency distribution for a certain data is given from the following table

Class Interval

Frequency

50-59

2

60-69

7

70-79

5

80-89

6

90-99

5

Then the percentage frequency for the class 90-99 is:

30%

28%

20%

25%

Given the following frequency distribution:

Class Boundaries (Ages)

14.5-19.5

19.5-24.5

24.5-29.5

29.5-34.5

Frequencies (No. of Students)

4

8

14

14

Number of students whose age is more than 24.5 is equal to

12

14

26

28

The frequency distribution below summarizes the home sale prices in the city of Summerhill for

the month of June. Determine the width of each class.

Sale price in thousand $

Frequency

10-19

3

20-29

5

30-39

4

40-49

9

10

9

11

12

In tossing of three coins at a time, the probability of getting exactly two Heads is 1/2.

True

False

A box contains 2 red, 3 black and 5 green balls. One ball is selected randomly. The probability

of obtaining black ball is 0.3.

True

False

A researcher takes a sample of 150 employees of a company, the average age of company’s

employees is an example of a parameter.

True

False

Census is the sub collection of members selected from a population.

True

False

At one college, GPA’s are normally distributed with a mean of 3 and a standard deviation of 1.

According to empirical rule, What percentage of students at the college have a GPA between 2

and 4?

84.13%

99.7%

95%

68%

A student had the following grades in the related courses:

Course

Mathematics

English language

PE

Weight

6

4

2

Grade

70

65

92

Given the weights of the courses, the weighted mean grade of the student is:

75.67

72

288

864

Listed below are the amounts of time (in months) that the employees of a restaurant have been

working at the restaurant. What is the median of this data?

22, 11, 55, 33, 99, 66

44 months

33 months

55 months

22 months

Let the maximum usual value of a data set is 150. If the mean of this set is 130, then the standard

deviation of the data set using Range rule of thumb is

15

10

20

5

Let the total frequency of a distribution is 50. If the relative frequency of a class of this

distribution is 0.20, then the frequency of that class is 1.

True

False

The frequency table for certain data is given in the following table:

Class

10-19

20-29

30-39

40-49

Frequency

5

6

5

7

The Relative frequency for the class 30-39 is 0.25

True

50-59

2

False

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