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When a new floral shop opened, a record of the daily number of phone calls was...
2. When a new floral shop opened, a record of the daily number of phone calls...
2. When a new floral shop opened, a record of the daily number of phone calls was kept. The records showed the following data. Let the number of calls be the random variable X. Use this summary to determine the probability that the number of phone calls is 2 per day. 1/30 1/15 1/10 3/15 7/15 3. The manufacturer of a particular battery pack for laptop computers claims its battery packs can function for 9 hours, on the average, before...
The number of phone calls arriving at a switchboard can be represented by a Poisson random...
The number of phone calls arriving at a switchboard can be represented by a Poisson random variable. The average number of phone calls per hour is 1.7. (a) Find the probability of getting a total of at least 3 phone calls in the next hour. (b) Find the probability of getting a total of at least 3 phone calls in the next two hours. (c) Find the probability that it is more than 30 minutes until the next call arrives....
A large call center outside a city tracks the number of phone calls recieved each day....
A large call center outside a city tracks the number of phone calls recieved each day. The daily number of phone calls recieved is normally distributed with μ = 152 μ = 152 and σ = 6.2 σ = 6.2 . Find the probability that on a randomly selected day the number of phone calls received is between 152 and 154. P(152 < X < 154) = Find the probability that a random sample of n = 25 n =...
A new phone system was installed last year to help reduce the expense of personal calls...
A new phone system was installed last year to help reduce the expense of personal calls that were being made by employees. Before the new system was installed, the amount being spent on personal calls follows a normal distribution with an average of $600 per month and a standard deviation of $50 per month. Refer to such expenses as PCE's (personal call expenses). Find the probability that a randomly selected month had a PCE that falls below $450. O 0.9987...
Q8. Phone calls received by a Police dept. are normally distributed. A random sample of 16...
Q8. Phone calls received by a Police dept. are normally distributed. A random sample of 16 days showed that the dept. received an average of 260 phone calls per day with a sample standard deviation of 31 calls. (10 points) a. Find a 95% confidence interval for the mean number of phone call received each day (3 point) b, without computing the 90% CI, can you draw a conclusion (still testing whether the mean # of phone calls is 220)...
Just part C please Q8. Phone calls received by a Police dept. are normally distributed. A...
Just part C please
Q8. Phone calls received by a Police dept. are normally distributed. A random sample of 16 days showed that the dept. received an average of 260 phone calls per day with a sample standard deviation of 31 calls. (10 points) a. Find a 95% confidence interval for the mean number of phone call received each day (3 point) b, without computing the 90% CI, can you draw a conclusion (still testing whether the mean # of...
Every day a company makes 100 phone calls. Each call has a 40% chance of being...
Every day a company makes 100 phone calls. Each call has a 40% chance of being answered. Calls are answered or not independently of each other. Every time a call is answered a sale is made in the amount X that is a random variable having a normal distribution with μ= 50 and σ= 5. Let Y be the number of answered calls during a day and let W be the total amount of daily sales. Assume that sales amounts...
Every day a company makes 100 phone calls. Each call has a 40% chance of being...
Every day a company makes 100 phone calls. Each call has a 40% chance of being answered. Calls are answered or not independently of each other. Every time a call is answered a sale is made in the amount X that is a random variable having a normal distribution with μ= 50 and σ= 5. Let Y be the number of answered calls during a day and let W be the total amount of daily sales. Assume that sales amounts...
During the period of time that a local university takes phone-in registrations, calls come in at...
During the period of time that a local university takes phone-in registrations, calls come in at the rate of one every two minutes. Clearly state what the random variable in this problem is? What is an appropriate distribution to be used for this problem and why? What is the expected number of calls in one hour? What is the probability of receiving three calls in five minutes? What is the probability of receiving NO calls in a 10-minute period? What...
I QUESTION 15 (a) Assumes that one out of ten customers entering a book shop buy...
I QUESTION 15 (a) Assumes that one out of ten customers entering a book shop buy books. If 10 customers visited the shop in one day, what is the probability that () One of the ten bought books, (i) Between two and five bought books, (li) No-one bought books. (b) Messages arrive at a reception desk in two different ways: via phone calls and via faxes. Assume that phone calls arrive on average at the rate of 2 per hour,...
A new phone system was installed last year to help reduce the expense of personal calls that were being made by employees. Before the new system was installed, the amount being spent on personal calls follows a normal distribution with an average of $600 per month and a standard deviation of $50 per month. Refer to such expenses as PCE's (personal call expenses). Find the probability that a randomly selected month had a PCE that falls below $450. O 0.9987...
Q8. Phone calls received by a Police dept. are normally distributed. A random sample of 16 days showed that the dept. received an average of 260 phone calls per day with a sample standard deviation of 31 calls. (10 points) a. Find a 95% confidence interval for the mean number of phone call received each day (3 point) b, without computing the 90% CI, can you draw a conclusion (still testing whether the mean # of phone calls is 220)...
Just part C please
Q8. Phone calls received by a Police dept. are normally distributed. A random sample of 16 days showed that the dept. received an average of 260 phone calls per day with a sample standard deviation of 31 calls. (10 points) a. Find a 95% confidence interval for the mean number of phone call received each day (3 point) b, without computing the 90% CI, can you draw a conclusion (still testing whether the mean # of...
I QUESTION 15 (a) Assumes that one out of ten customers entering a book shop buy books. If 10 customers visited the shop in one day, what is the probability that () One of the ten bought books, (i) Between two and five bought books, (li) No-one bought books. (b) Messages arrive at a reception desk in two different ways: via phone calls and via faxes. Assume that phone calls arrive on average at the rate of 2 per hour,...
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