Demand for residential electricity at a certain time period in Allen County is n

Question

Demand for residential electricity at a certain time period in   Allen County is normally distributed with a mean of ? = 4,700 megawatts (MW)   and a standard deviation of ? = 325 MW.   6) Due to   scheduled maintenance and unexpected system failures in a generating station,   the utility company can supply a maximum of 5,000 MW at that time.  The   probability that the utility will have to purchase electricity from other   utilities or allow brownouts is ______.

a 0.1788







b 0.8212







c 0.2676







d 0.7324

















7) The probability that   demand for electricity will exceed _____ MW is 0.1000. a 5,421







b 5,337







c 5,233







d 5,116

















8) The interval that   contains 95% of electricity demand volume is xL = ______ MW, and xU = ______ MW. a 4,131 5,269






b 4,063 5,337






c 4,018 5,383






d 3,943 5,457
















9) The time   spent by students on a particular E270 homework assignment follows a normal   distribution with a mean ? = 150 minutes and standard deviation ? = 40   minutes.  Then 90% of student finish   the assignment within Demand for residential electricity at a certain time period in   Allen County is normally distributed with a mean of ? = 4,700 megawatts (MW)   and a standard deviation of ? = 325 MW.   6) Due to   scheduled maintenance and unexpected system failures in a generating station,   the utility company can supply a maximum of 5,000 MW at that time.  The   probability that the utility will have to purchase electricity from other   utilities or allow brownouts is ______.

a 0.1788







b 0.8212







c 0.2676







d 0.7324

















7) The probability that   demand for electricity will exceed _____ MW is 0.1000. a 5,421







b 5,337







c 5,233







d 5,116

















8) The interval that   contains 95% of electricity demand volume is xL = ______ MW, and xU = ______ MW. a 4,131 5,269






b 4,063 5,337






c 4,018 5,383






d 3,943 5,457
















9) The time   spent by students on a particular E270 homework assignment follows a normal   distribution with a mean ? = 150 minutes and standard deviation ? = 40   minutes.  Then 90% of student finish   the assignment within

Explanation / Answer

6.a

7.c

8.b

9.a

10.d

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