c) A company claims that the mean amount of alcohol in the sanitizet that they produce is less than \( 35 \mathrm{mg} \) : A researcher took a sample of 50 sanitizers and found that the mean is \( 39 \mathrm{mg} \). It is known that the amount of alcohol for all sanitizer is normally distributed with a standard deviation of \( 14 \mathrm{mg} \).