ch 7 , Basic Statistics

.A study of long term phone calls made from general electricss corporate headquarters in fairfeild, conneticuit, revealed the length of the calls, in minutes follows the normal probability distribution. the mean length of time per call was 4.2 minutes and the standard deviation was .60 minutes. a. what fraction of calls last between 4.2 and 5 minutes B. what fraction of calls last more than 5 minutes C. what fraction of the calls last between 5 and 6 minutes D. what fraction of the calls last between 4 and 6 minutes E. as part of her report to the president the director of communications would like to report the length of the longest 4% of calls what is the time

2.The funds dispersed at the atm machine located near the checkout line at the krogers in union kentucky follows normal probability distribution with a mean of 4200 per day and a standard deviation of 720 per day. The machine is programmed to notify the nearby bank if the amount is very low( less than 2500) or very high( more than 6000) A. what percent of the days will the bank be notified because the amount dispensed is very low B. what is the percent of time will the bank be notified because the amount dispensed is to high C. what perfcent of the time will the bank not be notified regarding the amount dispersed

3. The price of shares of bank of florida at the end of trading each day for the last year followed the normal distribution. Assume there were 240 trading days in the year. The mean price was 42.00 per share and the standard deviation was 2.25 per share A. what percent of the days was the price over 45.00, How many days would you estimate B. What percent of days was the price between 38 and 40 C. what was the stock price on the highest 15% days
Posted Date: 3/3/2013 3:11:24 PM | Location : United States







Related Discussions:- ch 7 , Assignment Help, Ask Question on ch 7 , Get Answer, Expert's Help, ch 7 Discussions

Write discussion on ch 7
Your posts are moderated
Related Questions
A car moves with constant velocity along a straight road. Its position is x1 = 0m at t1 = 0 seconds and is x2 = 56 m at t2 = 5.0 s. what is the cars position at t=2.5 seconds and


what the advantages of quota sampling

The probability a computer will boot is .08. What is the least number needed so that the probability at least two will boot is greater than .99?

they gave me n=30 and p=.23 to get the answers for P(20,x,23)= and P(x.23)=

A team of archeologists have discovered the fossil skull of an extinct and exceptionally large crocodile (sarcosuchus).  Unfortunately, they have not been able to fi

Your friend Jose is trying to decide whether to buy or lease his next vehicle. He has gathered information about each option but is not sure how to compare the alternatives. Purcha

Fenn Museum, a nongovernmental not-for-profit organization, had the following balances in its statement of functional expenses: Education $300,000 Fundraising 250,000 Management an

how can write co variance using summation notation

The study of radioactive disintegrations indicates the emission of alpha, beta and gamma particles/rays to be of nuclear origin. Further, study of artificial radioactivity has reve