Question

Rachel has a boyfriend. Let X be the length of the first call that Rachel calls...

Rachel has a boyfriend. Let X be the length of the first call that Rachel calls her boyfriend today. Let Y be the number of times that she calls her boyfriend today. a) identify whether the X is descrete or continuous and its possible values. b) identify whether the Y is descrete or continuous and its possible values.
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Answer #1

A variable is discrete if its values came by counting . It can take an integer value .

Whereas a variable is called continous if its value come up by measuring. It is not countable .

A) X is the length of the first call . So this length will be know after measuring so it is a continuous variable . Its possible value can be 12.5 seconds , 13 seconds , 3.5 minutes or 2.5 hous ...2.23 hours etc .

B) Y is no. Of times Rachel calls her boyfriend , so it is countable . So Y is a discrete varaible . And its values can be 1 , 2 , 3 , 7 , 10 etc

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