Question

The mean of a normal probability distribution is 440; the standard deviation is 16. About 68% of the observations lie between what two values? About 95% of the observations lie between what two values? Practically all of the observations lie between what two values?

Answer #1

Solution :

Given that,

= 440

= 16

Using Empirical rule,

P( - 2< X < + 2) = 95%

P(440 - 2 * 16 < X < 440 + 2 * 16) = 95%

P(408 < X < 472) = 95%

The 95% of the observations lie between what two values are : 408 and 472

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About 95% of the observations lie between what two values?
Practically all of the observations lie between what two
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(a)
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(b)
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(c)
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Lower Value
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Lower Value
Upper Value
c. Nearly all of the observations lie between
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Lower Value
Upper Value

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Upper Value
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Lower Value
Upper Value
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%
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