(8) 3. The time a cell phone lasts until it needs to be recharged is normally...
(8) 3. The time a cell phone lasts until it needs to be recharged is normally distributed with a mean of 14 hours and a standard deviation of 3 hours. a) You have to have your cell phone work for 10 hours as you are going on a hike. What is the probability the cell phone will not make the 10 hours necessary? (in other words what % cell phones last 10 hours or less before needing to be recharged)?
b) What percent of cell phones last over 18 hours before they have to be recharged?
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(8) 3. The time a cell phone lasts until it needs to be
recharged is normally...
The amount of time that a mobile phone will work without having to be recharged is...
The amount of time that a mobile phone will work without having to be recharged is a random variable having the Exponential distribution with mean 2.2 days. a) Find the probability (to three decimal places) that such a mobile phone will have to be recharged in less than 1 days. b) Suppose a new model of smart phone has probability 0.3288 of needing to be recharged in less than 1 days. We have 17 of these new phones, all...
QUESTION 11 A full charged battery of a given mobile phone lasts a time T under...
QUESTION 11 A full charged battery of a given mobile phone lasts a time T under full utilization It was found that this lifetime T is normally distributed with a mean of 180 min and standard deviation of 20min. What value of lifetime in minutes is exceeded with 90% probability? 120.5 mn 134.4 mn 143.6 mn 154.3 mm 161.3 mn QUESTION 12 A full charged battery of a given mobile phone lasts a time T under full utilization It was...
9. The amount of time that a certain cell phone will keep a charge is known...
9. The amount of time that a certain cell phone will keep a charge is known to be normally distributed with a standard deviation o= 15 hours. A sample of 45 cell phones has a mean time of 145 hours. Let u represent the population mean time that a cell phone will keep a charge. a. What is the point estimate of u? b. What is the standard error of the point estimate? Round to three decimal places. c. Suppose...
The time until recharge for a battery in a laptop computer under common conditions is normally...
The time until recharge for a battery in a laptop computer under common conditions is normally distributed with mean of 200 minutes and a standard deviation of 60 minutes. What is the probability that a battery lasts more than 3 hours?
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Cell Phone Lifetimes A recent study of the lifetimes of cell phones found the average is 24.3 months. The standard deviation is 2.6 months. If a company provides its 32 employees with a cell phone, find the probability that the mean lifetime of these phones will be less than 23.7 months. Assume cell phone life is a normally distributed variable, the sample is taken from a large population and the correction factor can be ignored. Round the final answer to...
4. Assume that the length of time between charges of a particular cell phone is normally...
4. Assume that the length of time between charges of a particular cell phone is normally distributed with a mean of 8 hours and a standard deviation of 2 hours. Find the probability that the cell phone will last between 5 and 10 hours between charges. 5. Let X be a continuous random variable with the density function f(x) given by f(0) = 2/8 for 0 < x < 4, and f(1) = 0 otherwise. Find the mean p. 6....
8. A phone maker claims that its phones’ batteries last for 13.22 hours on average with...
8. A phone maker claims that its phones’ batteries last for 13.22 hours on average with standard usage with a standard deviation of 0.57 hours. (a) If we accept that claim, what is the probability that a battery lasts between 12 and 14 hours? (b) Find the 65th percentile for the battery lives- that is, a time for which 65% of the batteries last less than that time. (c) The company has just tested 29 devices. Find the probability that...
Many people consider their smart phone to be essential! Communication, news, Internet, entertainment, photos, and just...
Many people consider their smart phone to be essential! Communication, news, Internet, entertainment, photos, and just keeping current are all conveniently possible with a smart phone. However, the battery better be charged or the phone is useless. Battery life of course depends on the frequency, duration, and type of use. One study involving heavy use of the phones showed the mean of the battery life to be 9.25 hours with a standard deviation of 2.4 hours. Then the battery needs...
Many people consider their smart phone to be essential! Communication, news, Internet, entertainment, photos, and just...
Many people consider their smart phone to be essential! Communication, news, Internet, entertainment, photos, and just keeping current are all conveniently possible with a smart phone. However, the battery better be charged or the phone is useless. Battery life of course depends on the frequency, duration, and type of use. One study involving heavy use of the phones showed the mean of the battery life to be 9.75 hours with a standard deviation of 2.2 hours. Then the battery needs...
Fourteen percent of cell phone users use cell phones to access the Internet. 10 cell phone...
Fourteen percent of cell phone users use cell phones to access the Internet. 10 cell phone users are selected at random. The probability that at least 7 (out of 10) have used their phones to access the Internet is: a. 0.000008 b. 0.00008 c. 0.008 The probability that at most 6 (out of 10) have used their phones to access the Internet is: a. 0 b. 0.00008 c. 1.0 The probability that at least 7 (out of 10) have not...
QUESTION 11 A full charged battery of a given mobile phone lasts a time T under full utilization It was found that this lifetime T is normally distributed with a mean of 180 min and standard deviation of 20min. What value of lifetime in minutes is exceeded with 90% probability? 120.5 mn 134.4 mn 143.6 mn 154.3 mm 161.3 mn QUESTION 12 A full charged battery of a given mobile phone lasts a time T under full utilization It was...
9. The amount of time that a certain cell phone will keep a charge is known to be normally distributed with a standard deviation o= 15 hours. A sample of 45 cell phones has a mean time of 145 hours. Let u represent the population mean time that a cell phone will keep a charge. a. What is the point estimate of u? b. What is the standard error of the point estimate? Round to three decimal places. c. Suppose...
4. Assume that the length of time between charges of a particular cell phone is normally distributed with a mean of 8 hours and a standard deviation of 2 hours. Find the probability that the cell phone will last between 5 and 10 hours between charges. 5. Let X be a continuous random variable with the density function f(x) given by f(0) = 2/8 for 0 < x < 4, and f(1) = 0 otherwise. Find the mean p. 6....
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