# pls help me An electrical firm manufactures light bulbs that have a length of life that...

pls help me

An electrical firm manufactures light bulbs that have a length of life that is approximately normally distributed with a standard deviation of 35 hours. If a sample of 50 bulbs has an average life of 730 hours, find a 96% confidence interval for the population mean of all bulbs produced by this firm. Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. Click here to view page 1 of the table of critical values of the t-distribution. Click here to view page 2 of the table of critical values of the t-distribution. Х Standard Normal Distribution Table (Page 2) The confidence interval is << Critical Values of the t-Distribution (Page 2) (Round to the nearest integer as needed) Х Critical Values of the t-Distribution (Page 1) Х Critical Values of the t-Distribution V 0.01 31.821 1 2 3 4 5 0.02 15.894 4.849 3.482 2.999 0.015 21.205 5.643 3.896 3.298 3.003 0.005 63.656 9.925 5.841 0.0075 42.133 8.074 5.047 4.088 3.634 3.372 3.203 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 2.757 Critical Values of the Distribution 2.829 a 0.15 6 7 8 9 + 0.05 0.30 0.727 0.617 10 0.20 1.376 1.061 0.978 0.941 0.920 2 3 2.920 5 6 0.9319 1.250 1.190 1.156 1.134 1.119 1.105 1.100 1.093 1.088 1.083 1.079 1.076 1.074 1.071 2.715 2.634 2.574 2.527 2.491 2.461 2.436 2.415 2.397 2.382 2.368 2.356 2.346 2.336 2.328 8 0.40 0.325 0.289 0.277 0.271 0.267 0.265 0.263 0.262 0.261 0.260 0.260 0.259 0.259 0.258 0.258 0.258 0.257 0.257 0.257 0.257 0.257 0.256 0.256 0.256 0.256 0.256 0.256 0.256 0.256 0.256 0.255 0.254 0.254 0.253 0.40 0.569 0.559 0.553 0.549 0.546 0.543 0.542 0.540 0.539 0.538 0.537 0.536 0.535 0.534 0.534 0,533 0.533 0.532 0.532 0.532 0.531 0.531 0.531 0.531 0.530 0.530 0.530 0.529 0.527 0.526 0.906 0.896 0.889 0.883 0.879 0.876 0.873 0.870 0.868 0.866 0.865 0.863 0.862 0.861 0.860 0.859 0.858 0.859 0.857 0.856 0.856 0.855 2.612 2.517 2.449 2.398 2.359 2.328 2.303 2.282 2.264 2.249 2.233 2.224 2.214 2.205 2.197 2.189 2.183 2.177 2.172 2.167 2.162 2.158 2.154 2.150 2.147 2.123 0.10 3.078 1.886 1.638 1.533 1.476 1.440 1.415 1.397 1.383 1.372 1.363 1.356 1.350 1.345 1.341 1.337 1.333 1.330 1.328 1.325 1323 1.321 1.319 1.318 1.316 1.315 1.314 1.313 1.311 1.310 1.303 1.296 1.299 1.282 0.10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 10 4.541 3.747 3.365 3.143 2.998 2.896 2.821 2.764 2.718 2.681 2.650 2.624 2.602 2.583 2.567 2.552 2.539 2.528 2.518 2.508 2.500 2.492 2.485 2.479 2.473 2.467 2.462 2.457 2.423 2.390 2.358 2.326 0,01 0.025 12.706 4.303 3.182 2.776 2.571 2.447 2.365 2.306 2.262 2.228 2.201 2.179 2.160 2.145 2.131 2.120 2.110 2.101 2.093 2.086 2.080 2.074 2.069 2.064 2.060 2.056 2.052 2.048 2.045 2.042 2.021 2.000 1.980 1.960 0.025 2.132 2.015 1.943 1.895 1.860 1.833 1.812 1.796 1.782 1.771 1.761 1.753 1.746 1.740 1.734 1.729 1.725 1.721 1.717 1.714 1.711 1.708 1.706 1.703 1.701 1.699 1.697 1.684 1.671 0.0025 127,321 14.089 7.453 5.598 4.773 4.317 4.029 3.833 3.690 3.581 3,497 3.428 3.372 3.326 3.286 3.252 3.222 3.197 3.174 3.153 3.135 3.119 3.104 3.091 3.078 3.067 3.057 3.047 3.038 3.030 2.971 2.915 2.860 2.807 0.0025 0.0005 636.578 31.600 12.924 8.610 6.869 5.959 5.408 5.041 4.781 4.587 4.437 4.318 4.221 4140 4.073 4.015 3.965 3.922 3.883 3.850 3.819 3.792 3.768 3.745 3.725 3.707 3.689 3.674 3.660 3.646 11 12 4.032 3.707 3.499 3.355 3.250 3.169 3.106 3.055 3.012 2.977 2.947 2.921 2.898 2.878 2.861 2.845 2.831 2.819 2.807 2.797 2.787 2.779 2.771 2.763 2.756 2.750 2.704 2.680 2.617 2.576 0.005 2.998 2.932 2.879 2.836 2.801 2.771 2.746 2.724 2.706 2.689 2.674 2.661 2.619 2.639 2.629 2.620 2.612 2.605 2.598 2.592 2.586 2.581 2.542 2.504 2.468 2.432 0.0075 Areas under the Normal Curve .00 .01 .02 0.0 0.5000 0,5040 0.5080 0.1 0.5398 0.5438 0.5478 0.2 0.5793 0.5832 0.5871 0.3 0.6179 0.6217 0.6255 0.4 0.6554 0.6591 0.6628 0.5 0.6915 0.6950 0.6985 0.6 0.7257 0.7291 0.7324 0.7 0.7580 0.7611 0.7642 0.8 0.7881 0.7910 0.7939 0.9 0.8159 0.8186 0.8212 1.0 0.8413 0.8438 0.8461 1.1 0.8643 0.8665 0.8686 1.2 0.8849 0.8869 0.8888 1.3 0.9032 0.9049 0.9066 1.4 0.9192 0.9207 0.9222 1.5 0.9332 0.9346 0.9357 1.6 0.9452 0.9463 0.9474 1.7 0.9554 0.9564 0.9573 1.8 0.9641 0.9649 0.9656 1.9 0.9713 0.9719 0.9726 2.0 0.9772 0.9778 0.9783 2.1 0.9821 0.9826 0.9830 2.2 0.9861 0.9864 0.9868 2.3 0.9893 0.9896 0.9898 2.4 0.9918 0.9920 0.9922 2.5 0.9938 0.9940 0.9941 2.6 0.9953 0.9955 0.9956 2.7 0.9966 0.9966 0.9967 2.8 0.9974 0.9975 0.9976 2.9 0.9981 0.9982 0.9982 3.0 0.9987 0.9987 0.9987 3.1 0.9990 0.9991 0.9991 3.2 0.9993 0.9993 0.9994 3.3 0.9995 0.9995 0.9995 3.4 0.9997 0.9997 0.9997 .00 .01 .02 .03 .04 0.5120 0.5160 0.5517 0,5557 0.5910 0.5948 0.6293 0.6331 0.6664 0.6700 0.7019 0.7054 0.7357 0.7389 0.7673 0.7704 0.7967 0.7995 0.8238 0.8264 0.8485 0.8508 0.8708 0.8729 0.8907 0.8925 0.9082 0.9099 0.9236 0.9251 0.9370 0.9382 0.9484 0.9495 0.9582 0.9591 0.9664 0.9671 0.9732 0.9738 0.9788 0.9793 0.9834 0.9838 0.9871 0.9875 0.9901 0.9904 0.9925 0.9927 0.9943 0.9945 0.9957 0.9959 0.9965 0.9969 0.9977 0.9977 0.9983 0.9984 0.9988 0.9988 0.9991 0.9992 0.9994 0.9994 0.9996 0.9996 0.9997 0.9997 .03 .04 .05 0.5199 0,5596 0.5987 0.6368 0.6736 0.7088 0.7422 0.7734 0.8023 0.8299 0.8531 0.8749 0.8944 0.9115 0.9265 0.9394 0.9505 0.9599 0.9678 0.9744 0.9798 0.9842 0.9878 0.9906 0.9929 0.9946 0.9960 0.9970 0.9978 0.9984 0.9989 0.9992 0.9991 0.9996 0.9997 .06 0.5239 0.5636 0.6026 0.6406 0.6772 0.7123 0.7454 0.7764 0.8051 0.8315 0.8554 0.8770 0.8962 0.9131 0.9279 0.9406 0.9515 0.9608 0.9686 0.9750 0.9803 0.9846 0.9881 0.9909 0.9931 0.9948 0.9961 0.9971 0.9979 0.9985 0.9989 0.9992 0.9994 0.999G 0.9997 14 15 16 17 18 19 20 2.313 2 307 .07 0.5279 0.5675 0.6064 0.6143 0.6808 0.7157 0.7486 0.7794 0.8078 0.8340 0.8577 0.8790 0.8980 0.9147 0.9292 0.9418 0.9525 0.9616 0.9693 0.9756 0.9808 0.9850 0.9884 0.9911 0.9932 0.9949 0.9962 0.9972 0.9979 0.9985 0.9989 0.9992 0.9998 0.9996 0.9997 .08 .09 0.5319 0.5359 0.5714 0.5753 0.6103 0.6141 0.6180 0.6517 0.6844 0.6879 0.7190 0.7224 0.7517 0.7549 0.7823 0.7852 0.8106 0.8133 0.8365 0.8389 0.8599 0.8621 0.8810 0.8830 0.8997 0.9015 0.9162 0.9177 0.9306 0.9429 0.9441 0.9535 0.9545 0.9625 0.9633 0.9699 0.9706 0.9761 0.9767 0.98120.9817 0.9854 0.9857 0.9887 0.9890 0.9913 0.9916 0.9934 0.9936 0.9951 0.9952 0.9963 0.9964 0.9973 0.9974 0.9980 0.9981 0.9986 0.9986 0.9990 0.9990 0.9993 0.9993 0.9995 0.9995 0.9996 0.9997 0.9997 0.9998 .08 .09 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 2.301 2.296 40 2.099 2.291 2.286 2.282 2.278 2.250 2.223 2.196 2.170 0.015 3.460 1.067 1.066 1.064 1.063 1.061 1.060 1.059 1.058 1.058 1.057 1.056 1.055 1.055 1.050 1.045 1.041 1.036 0.15 21 22 23 21 25 26 27 28 29 30 60 120 2.076 2.054 0.02 3.373 3.290 0.0005 3.0 3.1 3.2 3.3 3.4 0.855 .05 .OG .07 Er 40 60 120 0.854 0.854 0.851 0.848 0.845 0.842 0.20 Print Done Print Done 0.524 1.615 0.05 0.30

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