3子。 The sample mean lifetime of electronic components produced by a certain method was 125 hours. Assunme that component lifetimes are normally distributed with population standard deviation o= 2o hours. Find the sample size needed so that an 80% confidence interval will have a margin of error of3. a) 73 O = 20 nニ 2g 2= 1.282 b. ア4 ez C. 9 d. 1チ1 (1.28)"(20) 73 e. nニ125

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A: Left end sum=sum of areas of the rectangles      =7X10+9.8X10+13.2X10+18.1X10+20.5X10      =68.6X10…

Q: Simplify. 2 [(2₁)4] ² 16;5 Enter your answer in the box.

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Q: a1 a2 a3 Suppose A = b₁ b₂ b₂ b3 and det A = 2. C1 C2 C3 b₁ +2c1 b2 +2c2 Let B = 5a1 5a2 C2 b3 +2c3…

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A: Given query is to find the value ofnthe indicated trigonometric function.

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Q: How is b equal to zero?

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Q: i. ii. iv. (A U B) iii. AnB (A U B)C vi. An BC V. An B AC n BC

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A: Solution: The objective is to complete the truth table

Q: In the diagram below, if AB= 40, CD = 25, and AD = 80, find BC. D. O 15 O 40 О 25 O 60

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Q: -3 1 -3 -2 A = B = -1 1 2 -2 Ex: 42 7 AB = АВ -5 2.

A: Given:        A=0-3-2-121        B=-310-12-2    Multiplying Matrix A and B   AB=0-3-2-121·-310-12-2

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Q: How are r and r squared interpreted?

A: The correlation coefficient (r), is used to define the linear relationship between the independent…

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A: A is a 3x3 matrix and B is a 3x1 matrix So the product AB will be possible. Because the number of…