Answer: The correct answer is : The deflection angles of the core 0 °, 15 ° and 45 °
Explanation: These angles of deflection of the nucleus serve for a precise directional contol of the air supply or the use of the return air. For floor use, the AL1 model air grilles are the most suitable with FG or FH edges due to strong reinforcement. Dust deposits are easily cleaned by removing the core from its frame. The models that are installed on the roof come with welded cores.
Answer: (11.95, 14.11)
Explanation:
Let x be a random variable that represent the number of years of education.
Given: Sample size : n= 26
Sample mean : 
Sample standard deviation : s = 3.22
Significance level : 
Degree of freedom: df = n-1 = 25
Critical t-value for
and df = 25 will be

90% confidence interval for mean:

A 90% confidence interval for the mean number of years of education = (11.95, 14.11)
Answer:
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