SDS 22. The amount of time ( in minutes ) devoted to commercials on a TV channel during any half- hour program is a random variable whose mean is 6...

Chapter: sampling distribution

C

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SDS 22.The amount of time ( in minutes ) devoted to commercials on a TV channel during anyhalf- hour program is a random variable whose mean is 6 .3 minutes and whose standarddeviation is 0 . 866 minutes . The approximate probability that a person who watches 36half- hour programs will be exposed to over 220 minutes of commercials is :( A ) 0. 4096 ( B ) 0. 0904^ ^ ( C ) 0. 9049( D ) 0 . 5000([ ) 0 . 2048