Answer: 196
Step-by-step explanation:
As per given , we have
Population standard deviation: 
Significance level : 
Using the z-value table , the critical z value for 98% confidence : 
Margin of error : E= 01 lb
Sample size : 

Simplify , we get

Hence, the minimum sample size required for books = 196
The best estimate for the diagonal of the rectangle is 3 ⇒ B
Step-by-step explanation:
In a rectangle:
- The length and the width are perpendicular
- The length of its diagonal =
(the diagonal is the hypotenuse of a right triangle whose legs are the length and the width of the rectangle)
∵ The width of a rectangle = x
∵ The length of the rectangle = 2x
∵ The diagonal = 
- Substitute the length by 2x and the width by x
∴ The diagonal = 
∴ The diagonal = 
∴ The diagonal = 
∵ x = 1.33
- Substitute the value of x by 1.33 to find the diagonal
∴ The diagonal = 
∴ The diagonal = 2.973
∴ The diagonal ≅ 3
The best estimate for the diagonal of the rectangle is 3
Learn more:
You can learn more about the rectangles in brainly.com/question/13084321
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N=9

n=9.333333333333333

that is 15 3's by the way.
CEVAP:....................