# Basis for the Range Rule of Thumb and the Empirical Rule. In Exercise, find the indicated area under the curve of the standard normal distribution, then convert it to a percentage andfill in the blank. The results form the basis for the range rule of thumb and the empirical rule introduced in Section 3-3.About_____% of the area is between z = − 2 and z=2 (or within 2 standard deviation of the mean).

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Basis for the Range Rule of Thumb and the Empirical Rule. In Exercise, find the indicated area under the curve of the standard normal distribution, then convert it to a percentage andfill in the blank. The results form the basis for the range rule of thumb and the empirical rule introduced in Section 3-3.

About_____% of the area is between z = − 2 and z=2 (or within 2 standard deviation of the mean).

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Step 1
Step 2

Use Table: Standard normal (z) distribution to find the areas.

Procedure:

For z at –2.00,

• Locate –2.0 in the left column of the table.
• Obtain the value in the corresponding row below 0.00
Step 3

For z at 2.00,

• Locate 2.0 in the left column of the table.
• Obtain the va...

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