Answer:
2 hours, 26 minutes
Step-by-step explanation:
2 boxes of 21 parts = 42 total parts
3 minutes per part = 42 x 3 = 126 minutes
10 minutes per box to package = 10 x 2 = 20 minutes
126 + 20 = 146 minutes
2 hours = 120 minutes
146 - 120 = 26
Final Answer: 2 hours, 26 minutes
I would guess it would be letter B. Let me know if I’m right.
D is the answer of your question
Answer:
C.I = 0.7608 ≤ p ≤ 0.8392
Step-by-step explanation:
Given that:
Let consider a random sample n = 400 candidates where 320 residents indicated that they voted for Obama
probability 
= 0.8
Level of significance ∝ = 100 -95%
= 5%
= 0.05
The objective is to develop a 95% confidence interval estimate for the proportion of all Boston residents who voted for Obama.
The confidence internal can be computed as:

where;
=
= 1.960
SO;






= 0.8 - 0.0392 OR 0.8 + 0.0392
= 0.7608 OR 0.8392
Thus; C.I = 0.7608 ≤ p ≤ 0.8392