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Chewy0087
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Statistics Question - Normal Distribution SOLVED
Hey, the question is shown in the attached document.
Mean = 79 Standard Deviation = 12
I dispise these questions, and I'm failing to grasp them at all.
I've done the first two parts fine, but it's part c I'm struggling on.
I've tried using the z function getting me to;
P (Z \leq \frac{b}{12} ) - P ( Z \leq \frac{-a}{12} ) = 0.375
But I've got no idea what I'm doing :/ this question has totally thrown me, all of the methods I've used replacing the 2nd equation into the first have given me useless answers, I can usually do these questions fine, but I'm struggling here, any help would be great!
Homework Statement
Hey, the question is shown in the attached document.
Homework Equations
Mean = 79 Standard Deviation = 12
The Attempt at a Solution
I dispise these questions, and I'm failing to grasp them at all.
I've done the first two parts fine, but it's part c I'm struggling on.
I've tried using the z function getting me to;
P (Z \leq \frac{b}{12} ) - P ( Z \leq \frac{-a}{12} ) = 0.375
But I've got no idea what I'm doing :/ this question has totally thrown me, all of the methods I've used replacing the 2nd equation into the first have given me useless answers, I can usually do these questions fine, but I'm struggling here, any help would be great!
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