b) What is VAR[C], the variance of C ?

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.5: Comparing Sets Of Data
Problem 13PPS
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Q2) Voice calls cost 20 cents each and data calls cost 30 cents each. C is the cost of one
telephone call. The probability that a call is a voice call is P[V] = 0.6. The probability of a data
call is P[D] = 0.4.
b) What is VAR[C], the variance of C ?
Transcribed Image Text:Q2) Voice calls cost 20 cents each and data calls cost 30 cents each. C is the cost of one telephone call. The probability that a call is a voice call is P[V] = 0.6. The probability of a data call is P[D] = 0.4. b) What is VAR[C], the variance of C ?
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