### Multiple choice questions on Normal distribution, Confidence Interval

1. The amount of pyridoxine (in grams) per multiple vitamin is normally distributed with m = 110 grams and Q(standard deviation)= 25 grams. A sample of 25 vitamins is to be selected. So, the middle 70% of all sample means will fall between what two values? a) 104.8 and 115.2 b) 108.4 and 112.5 c) 115 and 100.7 d) 85 and 12