Solution :
Given that ,
10) mean = = 7
standard deviation = = 5
P( - 2< x < 10) = P[(- 2 - 7) / 5) < (x - ) / < (10 - 7) / 5) ]
= P( - 1.8 < z < 0.6 )
= P(z < 0.6) - P(z < - 1.8)
Using z table,
= 0.7257 - 0.0359
= 0.6898
Given that ,
11) mean = = 53
standard deviation = = 34
Using standard normal table,
P(Z > z) = 35%
= 1 - P(Z < z) = 0.35
= P(Z < z) = 1 - 0.35
= P(Z < z ) = 0.65
= P(Z < 0.39) = 0.65
z = 0.39
Using z-score formula,
x = z * +
x = 0.39 * 34 + 53
x = 66.26
show work write on paper please 10. A normal population has mean u = 7 and...
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