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According to the statement of the question, we can write the following equation:
<h2>3X/4 + 6 = X - 4</h2>solving this equation
3X/4 + 6 = X - 4
3X/4 - X = - 4 - 6
4X - 3X = 40
<h2>X = 40</h2><em>refer to attached</em>
Answer:
0.0266, 0.9997,0.7856
Step-by-step explanation:
Given that the IQs of university​ A's students can be described by a normal model with mean 140 and standard deviation 8 points. Also suppose that IQs of students from university B can be described by a normal model with mean 120 and standard deviation 11. Let x be the score by A students and Y the score of B.
A)
B) Since X and Y are independent we have
X-Y is Normal with mean = 140-120 =20 and
C) For a group of 3, average has std deviation =