<span>Given that the average time it takes to replace a defective car radiator is 70 minutes with a standard deviation of 12 minutes.

The 90% confidence interval of a random sample of 50 is given by

$90\% \ C.I.=70\pm1.645 \frac{12}{\sqrt{50}} \\ \\ \Rightarrow 70+1.645 \frac{12}{\sqrt{50}} \ and \ 70-1.645 \frac{12}{\sqrt{50}}$ </span>

8 0

4 years ago

A class of 31 students average 82 on a recent exam. Two students were absent and took the exam the next day. The two students av

dedylja [7]

Find the total points for each group:

31 students averaged 82, so the total points were 31 x 82 = 2542

2 students averaged 88, so the total points were 2 x 88 = 176

Now add the total points and divide by 33 students (31 +2):

2542 + 176 = 2718

2718 / 33 = 82.36

The average is 82.36 ( Round as needed).

4 0

3 years ago

Read 2 more answers

In a fixed-order-quantity system, when demand is uncertain, using economic order quantity (EOQ) based only on the average demand

Ganezh [65]

Answer:

b. False

Step-by-step explanation:

In a fixed-order-quantity system, when there is uncertainty in demand, the average demand will lead to a high probability of a stockout which is in contrast to what is stated in the question. Thus, the answer is false.

8 0

3 years ago

Scientific notation of 141700000

Anton [14]

Answer:

Step-by-step explanation:

Given the value 141700000, we are to express in scientific notation

The standard form is expressed as A * 10^n

A is any integer between 1 and 10

n is also any integer

141700000.= 1.47 * 10^8

Note that the decimal point was shifted back 8 times, main reason the power is 8

4 0

3 years ago