Q10) The probability here is computed as:
P(-1.25 <= Z <= -0.75)
= P(Z <= -0.75) - P(Z <= -1.25)
Getting it from the standard normal tables, we have here:
= 0.2266 - 0.1056
= 0.1210
Therefore 0.1210 is the required probability here.
Q11) The distribution here is given as:
The probability here is computed as:
P(X > 40)
Getting it from the standard normal tables, we have here:
Therefore 0.0478 is the required probability here.
Q12) We are given the distribution here as:
For a normal distribution, median = mean = 100
Therefore 100 is the required median value here.
QUESTION 10 4 If Z is a standard normal random variable, then P(-1.25<= Z <=-0.75) is...
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