Question

μ = 25 and σ = 2. Find P(21 ≤ x ≤ 26).

μ = 25 and σ = 2.

Find P(21 ≤ x ≤ 26).

Math   Statistics-And-Probability   
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Homework Answers

Answer #1

Solution :

Given that ,

mean = = 25

standard deviation = =2

P(21 x 26 )

= P[(21-25 / 2) (x - ) / (26-25 /2 ) ]

= P(-2 z 0.5 )

= P(z 0.5 ) - P(z -2)

Using z table,

=0.6915 - 0.0228

=0.6687

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