Normal Distribution

Question

In a given word problem, it is customary that all values are given. In the case of a word problem with normal distribution, it is common that the values of the score, the mean, and the standard deviation are given to compute for the value z. Likewise, it is also common that the value of z is already given. But what if in a given word problem concerning normal distribution, the values of the score (X) and the mean are missing and are required to be solved, how will you solve it? What if the word problem requires a percentage? How should you solve it?

Answer 1

Well if you know z and standard deviation, and are missing X and mean, you can't solve it, as you have one equation with two unknowns (you need an extra equation)

And which percentage do you mean ? Very unclear.