The approximate costs for a 30-second spot for various cable networks in a random selection of cities
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The approximate costs for a 30-second spot for various cable networks in a random selection of cities are shown below. Estimate the true population mean cost for a 30- second advertisement on cable network with 90% confidence.
14 55 165 9 15 66 23 30 150
22 12 13 54 73 55 41 78
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