So I'm after the probability the jar will contain less than 448 grams.

Ajar of peanut butter contains 451 grams with a standard deviation of 10.6 grams. Assuming a normal distribution, nd the probability that a jar contains less than 448 grams. The column under A gives the proportion of the area under the entire curve that is between 2 - O and a positive value of z. The column under A gives the proportion of the area under the entire curve that is between 2: 0 and a positive value of z