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Approximately 84% of the smart phones that use the new enhanced Galoy wireless charger were fully charged within 35 minutes while only about 16% were

Approximately 84% of the smart phones that use the new enhanced Galoy wireless charger were fully charged within 35 minutes while only about 16% were charged in less than 15 minutes. Suppose the charging times are normally distributed, determine their mean and standard deviation.

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