Question
In: Statistics and Probability
A random sample of nequals100 observations is selected from a population with muequals31 and sigma equals...
A random sample of nequals100 observations is selected from a population with muequals31 and sigma equals 24. Complete parts a through f.
Find
P(x overbarxgreater than or equals≥28).
Solutions
Expert Solution
Solution :
mean = 
= 31
standard deviation = 
= 24
n = 100
=
= 31
=
/ 
n = 24 /
100 = 2.4
P(
28) = 1 - P(
28)
= 1 - P[(
-
) /
(28 - 31) /2.4 ]
= 1 - P(z
-1.25)
Using z table,
= 1 - 0.1056
= 0.8944
orchestra answered 2 years agoRelated Solutions
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