Given Mean = 48
Standard Deviation = 9
We need to find P(X 40)
z-score = (X - ) /
= (40 - 48) / 9
= -8 / 9
= -0.88889
The area to the left of z-score will give us P(X 40) which is 0.1870314 from online calculator since the z-tables wont give us the exact area
So P(X 40) = 0.1870314
= 0.1870 rounded to four decimal places
The normal curve will be similar to one in option B since Mean 48 wil be at the centre and 40 will be to the left of it and the shaded region should be less than or equal to 40
So Answer is Option B
Assume that the random variable X is normally distributed, with mean 48 and standard deviation =...
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