The Illumination of a Light Bulb Is Targeted at 1,170

question 135

Multiple Choice

The illumination of a light bulb is targeted at 1,170 lumens. The standard deviation is ±16.6 A technician randomly selects 15 bulbs per hour and records the mean illumination each hour. Determine the most accurate mean control chart drawn from the data shown in the table.
 
Hour
Illumination
1
1,145
2
1,156
3
1,141
4
1,183
5
1,180
6
1,180
Hour
Illumination
7
1,177
8
1,191
9
1,193
10
1,188
11
1,172
12
1,171
Hour
Illumination
13
1,179
14
1,161
15
1,159
16
1,173
17
1,190
18
1,143
Hour
Illumination
19
1,181
20
1,187
21
1,191
22
1,144
23
1,158
24
1,181
Hour
Illumination
25
1,192
26
1,191
27
1,165
28
1,181
29
1,168
30
1,195

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Definitions:

IRR

The Internal Rate of Return is a financial metric used to estimate the profitability of potential investments, calculated as the rate that makes the net present value (NPV) of all cash flows from a particular project equal to zero.

NPV

Net Present Value; a financial metric used to evaluate the profitability of an investment, calculated by subtracting the initial investment from the present value of cash inflows.

AAR

Average Annual Return; calculating the mean annual return of an investment over a specified time period.

Discounted Payback

An investment appraisal method that calculates the time required to break even in present value terms, factoring in the time value of money.