b) What is VAR[C], the variance of C ?
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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 ?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F36632e20-53e6-4c4b-83e3-efdc24c19507%2F082fa970-2b08-463b-ac2f-632920811455%2Fj4637vm_processed.png&w=3840&q=75)
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