QUESTION 2 The probability mass function of a discrete random variable x is defi

Question

QUESTION 2

The probability mass function of a discrete random variable x is defined as p(x) = x/10 for x = 0, 1, 2, 3, and 4. Then, the probability that x is at most 3 is

.10

.30

.60

.90

2 points   

QUESTION 3

When data are collected in a statistical study for only a portion or subset of all elements of interest we are using a:

sample

census

sampling frame

population

2 points   

QUESTION 4

A stem-and-leaf display describes two-digit integers between 30 and 85. For one of the classes displayed, the row appears as 6|357. What numerical values are being described?

36, 56, and 76

50, 60, and 70

63, 65, and 67

35 and 57

.10

.30

.60

.90

Explanation / Answer

Please post 1 question per answer, as per forum rules.

Q2)

p(x) = x/10, for x=0,1,2,3,4

P(X<=3) = (0)/10 + 1/10 + 2/10 +3/10 = .60

Hence, 0.6 is the right answer

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