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10.10.2019 •
Mathematics
Determine whether the value is a discrete random variable, continuous random variable, or not a random variable.
(a) the number of hits to a website in a day
(b) the amount of rain in city upper b during april
(c) the response to the survey question "did you smoke in the last week question mark "
(d) the number of statistics students now reading a book
(e) the number of light bulbs that burn out in the next week in a room with 16 bulbs
(f) the height of a randomly selected giraffe
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Ответ:
a) discrete random variable
b) continuous random variable
c) Not a random variable
d) discrete random variable
e) discrete random variable
f) continuous random variable
Step-by-step explanation:
First, let's remember the following definitions:
A discrete random variable is a variable that takes a countable number of values and the sum of all of them equals one; it depends on a random phenomenon.A continuous random variable is a variable that can take an infinite uncountable values (for example in the real numbers) and it depends on a random phenomenonWith these definitions in mind we have:
a) The number of hits to a website in a day: Discrete random variable (it takes a countable number of values (1,2,3,4...)
b)The amount of rain in City Upper B during April: Continuous random variable (the amount of rain falls in the real numbers)
c) The response to the survey question "Did you smoke in the last week?": not a random variable. There are only two answers: yes or no.
d) The number of statistics students now reading a book: Discrete variable (it can be 1, 2, 3,4,... students)
e) The number of light bulbs that burn out in the next week in a room with 16 bulbs: Discrete random variable (the possible outcomes are 0,1,2...15,16)
f) The height of a randomly selected giraffe: Continuous random variable. (the height values are real numbers)
Ответ:
B. g(x)=-2^x
explanation -