Here, we want to find the value of c for which the given probability equals the given value
All we have to do here is to find the z-score that corresponds to this value
To do this, we can use the standard normal distribution table
Alll we have to do is to get the z-score that corresponds to the given probability
By the use of the standard normal distribution table, the value of c that correlates to this particular probability value is -1.334
To 2 decimal places, this is -1.33