## Question

###### We know the length of- lime between charges for the NiCad batteries for laptops follows normal distribution and the mean is 50 hours and the standard deviation is 15 hours. Ilavibmodnayakalxa owns computer and would like to know the probability that the length of time between charging will be between 45 and 55 hours What is the probability that the length of time between charging will be less than 40 hours? What is the probability that the length of time between charging will be more than 55 hou

We know the length of- lime between charges for the NiCad batteries for laptops follows normal distribution and the mean is 50 hours and the standard deviation is 15 hours. Ilavibmodnayakalxa owns computer and would like to know the probability that the length of time between charging will be between 45 and 55 hours What is the probability that the length of time between charging will be less than 40 hours? What is the probability that the length of time between charging will be more than 55 hours? 2) Suppose that you enter fishing contest The contest takes place in a pond where the fish lengths have norma distribution with mean 16 inches and standard deviation inches. Now suppose you want to know what length marks the bottom 10 percent of all the fish lengths in the pond What fish length are you looking for? The Daily $ & return follows normal distribution with mean of 0.00032 and standard deviation of 0.00859. What is the probability that Daily S & P return will be greater than 0.01? If we choose random sample of 20 days what is the sampling distribution? For these randomly chosen 20 days_ what is the probability that the rate of return will be larger than 0.005? Etaratuglgotek is researcher and she wants to determine the effectiveness of an exercise regimen. She gets 41 volunteers who participated in it and finds that for these volunteers the mean heart rate is 82.02 beats per minute and the standard deviation is 8.13 beats per minute_ Construct 90 % confidence interval for these volunteers_ Suppose we want to know the average age of a student at Bennistefjollneix College within 0 years_ We'd like to be 99 % confident about our result. From previous study we know the standard deviation to be 2.9 years_ Calculate the required sample size Ginilannarihcuritxanop has been told that The Dawrahdillabuzxma Company manufactures bulbs with an average time life which is 470 hours Ginilannarihcuritxanop thinks that the average life time is much less. He collects 100 light bulbs and finds that the mean is 465 hours deviation is 25 hours. Test with a standard Ginilannarihcuritxanop' significance claim at the " 5 % level of