Since adult cereal is normally distributed with known mean and known standard deviation, the best way to find this probability is to find the z-score corresponding to adult cereal weighing 895 grams and then using a normal probability table to find an approximate probability (usually accurate to 4 decimal places).
The z-score is (895-920)/10=-2.5. So, Chennai escort the probability that adult cereal will weigh less than 895 grams is 0.0062.