Find the Indicated Probability or Percentage for the Sampling Error

Multiple Choice

Find the indicated probability or percentage for the sampling error.
-The monthly expenditures on food by single adults in one city are normally distributed with a mean of $410 and a standard deviation of $70. What is the probability that the sampling error made
In estimating the mean monthly expenditure of all single adults in that city by the mean of a
Random sample of 90 such adults will be at most $10?

A) 0.9131
B) 0.9990
C) 0.1114
D) 0.8262