Auto batteries have an average life of 2.7 years. Battery life is normally distributed with a mean of 2.7 years and a standard deviation of 0.43 years. The batteries are warranted to operate for a minimum of 2 years. If a battery fails within the warranty period, it will be replaced with a new battery at no charge. The company sells and installs the batteries. Also, the usual $5 installation charge will be waived. Use and Table B. a. What percentage of batteries would you expect to fail before the warranty period expires? (Round your z value to 2 decimal places. Round probabilities to 4 decimal places. Round your final answer to 2 decimal places.) Percentage b. A competitor is offering a warranty of 26 months on its premium battery. The manager of this company is toying with the idea of using the same battery with a different exterior, labeling it as a premium battery, and offering a 26-month warranty on it. What percentage of the batteries would you expect to fail before this new warranty period expires? (Round your z value to 2 decimal places. Round probabilities to 4 decimal places. Round your final answer to 2 decimal places.) Percentage

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Auto batteries have an average life of 2.7 years. Battery life is normally distributed with a mean of 2.7 years and a standard deviation of
0.43 years. The batteries are warranted to operate for a minimum of 2 years. If a battery fails within the warranty period, it will be
replaced with a new battery at no charge. The company sells and installs the batteries. Also, the usual $5 installation charge will be
waived.
Use and Table B.
a. What percentage of batteries would you expect to fail before the warranty period expires? (Round your z value to 2 decimal places.
Round probabilities to 4 decimal places. Round your final answer to 2 decimal places.)
Percentage
%
b. A competitor is offering a warranty of 26 months on its premium battery. The manager of this company is toying with the idea of
using the same battery with a different exterior, labeling it as a premium battery, and offering a 26-month warranty on it. What
percentage of the batteries would you expect to fail before this new warranty period expires? (Round your z value to 2 decimal
places. Round probabilities to 4 decimal places. Round your final answer to 2 decimal places.)
Percentage
Transcribed Image Text:Auto batteries have an average life of 2.7 years. Battery life is normally distributed with a mean of 2.7 years and a standard deviation of 0.43 years. The batteries are warranted to operate for a minimum of 2 years. If a battery fails within the warranty period, it will be replaced with a new battery at no charge. The company sells and installs the batteries. Also, the usual $5 installation charge will be waived. Use and Table B. a. What percentage of batteries would you expect to fail before the warranty period expires? (Round your z value to 2 decimal places. Round probabilities to 4 decimal places. Round your final answer to 2 decimal places.) Percentage % b. A competitor is offering a warranty of 26 months on its premium battery. The manager of this company is toying with the idea of using the same battery with a different exterior, labeling it as a premium battery, and offering a 26-month warranty on it. What percentage of the batteries would you expect to fail before this new warranty period expires? (Round your z value to 2 decimal places. Round probabilities to 4 decimal places. Round your final answer to 2 decimal places.) Percentage
Table B
1. Areas under the
standardized normal
curve, from - to -z
.09
.08
.07
.06
.05
.04
.03
.02
01
,00
.0002
.0003
.0003
.0003
.0003
.0003
.0003
.0003
.0003
.0003
-3.4
.0003
.0004
.0004
.0004
.0004
.0004
.0004
.0005
.0005
.0005
-3.3
.0005
.0005
.0005
.0006
.0006
.0006
.0006
.0006
.0007
.0007
-3.2
.0007
.0007
.0008
.0008
.0008
.0008
.0009
.0009
.0009
.0010
-3.1
.0010
.0010
.0011
.0011
.0011
.0012
.0012
.0013
.0013
.0013
-3.0
.0014
.0014
.0015
.0015
.0016
.0016
.0017
.0018
.0018
.0019
-2.9
.0019
.0020
.0021
.0021
.0022
.0023
.0023
.0024
.0025
.0026
-2.8
.0026
.0027
.0028
.0029
.0030
.0031
.0032
.0033
.0034
.0035
-2.7
.0036
.0037
.0038
.0039
.0040
.0041
.0043
.0044
.0045
.0047
-2.6
.0048
.0049
.0051
.0052
.0054
.0055
.0057
.0059
.0060
.0062
-2.5
.0064
.0066
.0068
.0069
.0071
.0073
.0075
.0078
.0080
.0082
-2.4
.0084
.0087
.0089
.0091
.0094
.0096
.0099
.0102
.0104
.0107
-2.3
.0110
.0113
.0116
.0119
.0122
.0125
.0129
.0132
.0136
.0139
-2.2
.0143
.0146
.0150
.0154
.0158
.0162
.0166
.0170
.0174
.0179
-2.1
.0183
.0188
.0192
.0197
.0202
.0207
.0212
.0217
.0222
.0228
-2.0
.0233
.0239
.0244
.0250
.0256
.0262
.0268
.0274
.0281
.0287
-1.9
.0294
.0301
.0307
.0314
.0322
.0329
.0336
.0344
.0351
.0359
-1.8
.0367
.0375
.0384
.0392
.0401
.0409
.0418
.0427
.0436
.0446
-1.7
.0455
.0465
.0475
.0485
.0495
.0505
.0516
.0526
.0537
.0548
-1.6
.0559
.0571
.0582
.0594
.0606
.0618
.0630
.0643
.0655
.0668
-1.5
.0681
.0694
.0708
.0721
.0735
.0749
.0764
.0778
.0793
.0808
-1.4
.0823
.0838
.0853
.0869
.0885
.0901
.0918
.0934
.0951
.0968
-1.3
.0985
.1003
.1020
.1038
.1056
.1075
.1093
.1112
.1131
.1151
-1.2
.1170
.1190
.1210
.1230
1251
1271
.1292
.1314
.1335
.1357
-1.1
.1379
.1401
.1423
.1446
.1469
.1492
.1515
.1539
.1562
.1587
-1.0
.1611
.1635
.1660
.1685
.1711
.1736
.1762
.1788
.1814
.1841
-0.9
.1867
.1894
.1922
.1949
.1977
2005
.2033
.2061
.2090
.2119
-0.8
.2148
.2177
2206
.2236
.2266
.2296
.2327
2358
.2389
2420
-0.7
2451
.2483
2514
2546
2578
2611
2643
2676
.2709
.2743
-0.6
.2776
.2810
2843
2877
2912
2946
.2981
.3015
.3050
.3085
-0.5
3121
.3156
3192
3228
.3264
3300
3336
3372
.3409
3446
-0.4
.3483
.3520
3557
3594
3632
3669
3707
3745
.3783
.3821
-0.3
.3859
.3897
3936
3974
4013
4052
4090
.4129
.4168
4207
-0.2
4247
4286
4325
4364
.4404
4443
4483
.4522
4562
.4602
-0.1
.4641
.4681
4721
4761
4801
4840
4880
.4920
.4960
.5000
-0.0
Transcribed Image Text:Table B 1. Areas under the standardized normal curve, from - to -z .09 .08 .07 .06 .05 .04 .03 .02 01 ,00 .0002 .0003 .0003 .0003 .0003 .0003 .0003 .0003 .0003 .0003 -3.4 .0003 .0004 .0004 .0004 .0004 .0004 .0004 .0005 .0005 .0005 -3.3 .0005 .0005 .0005 .0006 .0006 .0006 .0006 .0006 .0007 .0007 -3.2 .0007 .0007 .0008 .0008 .0008 .0008 .0009 .0009 .0009 .0010 -3.1 .0010 .0010 .0011 .0011 .0011 .0012 .0012 .0013 .0013 .0013 -3.0 .0014 .0014 .0015 .0015 .0016 .0016 .0017 .0018 .0018 .0019 -2.9 .0019 .0020 .0021 .0021 .0022 .0023 .0023 .0024 .0025 .0026 -2.8 .0026 .0027 .0028 .0029 .0030 .0031 .0032 .0033 .0034 .0035 -2.7 .0036 .0037 .0038 .0039 .0040 .0041 .0043 .0044 .0045 .0047 -2.6 .0048 .0049 .0051 .0052 .0054 .0055 .0057 .0059 .0060 .0062 -2.5 .0064 .0066 .0068 .0069 .0071 .0073 .0075 .0078 .0080 .0082 -2.4 .0084 .0087 .0089 .0091 .0094 .0096 .0099 .0102 .0104 .0107 -2.3 .0110 .0113 .0116 .0119 .0122 .0125 .0129 .0132 .0136 .0139 -2.2 .0143 .0146 .0150 .0154 .0158 .0162 .0166 .0170 .0174 .0179 -2.1 .0183 .0188 .0192 .0197 .0202 .0207 .0212 .0217 .0222 .0228 -2.0 .0233 .0239 .0244 .0250 .0256 .0262 .0268 .0274 .0281 .0287 -1.9 .0294 .0301 .0307 .0314 .0322 .0329 .0336 .0344 .0351 .0359 -1.8 .0367 .0375 .0384 .0392 .0401 .0409 .0418 .0427 .0436 .0446 -1.7 .0455 .0465 .0475 .0485 .0495 .0505 .0516 .0526 .0537 .0548 -1.6 .0559 .0571 .0582 .0594 .0606 .0618 .0630 .0643 .0655 .0668 -1.5 .0681 .0694 .0708 .0721 .0735 .0749 .0764 .0778 .0793 .0808 -1.4 .0823 .0838 .0853 .0869 .0885 .0901 .0918 .0934 .0951 .0968 -1.3 .0985 .1003 .1020 .1038 .1056 .1075 .1093 .1112 .1131 .1151 -1.2 .1170 .1190 .1210 .1230 1251 1271 .1292 .1314 .1335 .1357 -1.1 .1379 .1401 .1423 .1446 .1469 .1492 .1515 .1539 .1562 .1587 -1.0 .1611 .1635 .1660 .1685 .1711 .1736 .1762 .1788 .1814 .1841 -0.9 .1867 .1894 .1922 .1949 .1977 2005 .2033 .2061 .2090 .2119 -0.8 .2148 .2177 2206 .2236 .2266 .2296 .2327 2358 .2389 2420 -0.7 2451 .2483 2514 2546 2578 2611 2643 2676 .2709 .2743 -0.6 .2776 .2810 2843 2877 2912 2946 .2981 .3015 .3050 .3085 -0.5 3121 .3156 3192 3228 .3264 3300 3336 3372 .3409 3446 -0.4 .3483 .3520 3557 3594 3632 3669 3707 3745 .3783 .3821 -0.3 .3859 .3897 3936 3974 4013 4052 4090 .4129 .4168 4207 -0.2 4247 4286 4325 4364 .4404 4443 4483 .4522 4562 .4602 -0.1 .4641 .4681 4721 4761 4801 4840 4880 .4920 .4960 .5000 -0.0
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