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459 randomly selected lightbulbs were tested in a laboratory 291 lasted more than 500 hours find a point estimate of the true proportion of all lightbulbs in that last more than 500 hours
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459 randomly selected lightbulbs were tested in a laboratory 291 lasted more than 500 hours find a point estimate of the true proportion of all lightbulbs in that last more than 500 hours

User RomaValcer
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291:459 or 291/459 it is the amount lasted to the total amount
User Zephor
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