A food safety engineer has discovered that a food warmer has temperature problems. While they set up the temperature at 78c, it heats with the mean of 78c but a standard deviation of 2c.

The problem is that any food that drops below 74c can create food poison for the consumers.

What is the probability of having non-standard food from this food warmer? In other words, what proportion of food can be a health hazard? (Use the number only without any extra character or % sign)