The luncheon expense vouchers of the executives of a large advertising firm have a population mean 10 G S4 per person Below what dollar value will 99 of the sample means fall What proportion of the sample means will be between 8 and 12 What proportion of the sample means will be below 8 or above 12 What proportion of the cample incans will be below 8 What proportion of the sample means will be above 13