The county highway department recorded the following probabilities for the number of accidents per day on...
The number of suits sold per day at a retail store is shown in the table, with the corresponding probabilities. PLEASE FIND MEAN, VARIANCE, AND STANDARD DEVIATION Number of suits sold X2021222324Probability P(X)0.10.20.30.1 0.3
The number of traffic accidents per day on a certain section of highway is thought to be Poisson distributed with a mean equal 2.19. Then the standard deviation of number of accidents is: a. (2.19) 2 b. 3.14 c. approximately 1.48 d. 2.19 e. approximately 4.80
There are 12 accidents per month on a highway. Define the random variable X= no.of accidents in a week. a) What distribution does X follow? b) Find the mean, variance, standard deviation of the random variable X. c) Find the probability of producing 5 accidents in a week.
The number of computers sold per day at a local computer store, along withits corresponding probabilities, is shown in the table. calculate the mean, variance and standard deviation of the probability distribution.
A highway department executive claims that the number of fatal accidents which occur in her state does not wary from month to month. The results of a study of 110 fatal accidents were recorded. Is there enough evidence to reject the highway department executive's claim about the distribution of fatal accidents between each month? Jan Feb Mar Oct Nov Dec Month Fatal Accidents Apr May Jun Jul Aug Sep 6 9 14 6 14 6 8 8 6 8 10...
A highway department executive claims that the number of fatal accidents which occur in her state does not vary from month to month. The results of a study of 171 fatal accidents were recorded. Is there enough evidence to reject the highway department executive's claim about the distribution of fatal accidents between each month? Month Fatal Accidents Jan 13 Feb Mar 11 16 Apr May Jun 12 14 21 Jul 11 Aug 7 Sep 11 Oct 10 Nov 23 Dec...
A landscape contractor bids on jobs where he can make S3250 profit. The probabilities of getting 1, 2, 3, or 4 jobs per month are shown. PLEASE FIND MEAN, VARIANCE, AND STANDARD Number of jobs X1 Probabaliy P2D 0 0043 0.1 0.2 0.4 0.3
A civil engineer has been studying the frequency of vehicle accidents on a certain stretch of interstate highway. Longterm history indicates that there has been an average of 1.70 accidents per day on this section of the interstate. Let r be a random variable that represents number of accidents per day. Let O represent the number of observed accidents per day based on local highway patrol reports. A random sample of 90 days gave the following information. r 0 1...
The number of accidents per week at a busy intersection was recorded for a year. There were 19 weeks with no accidents, 17 weeks with one accident, 9 weeks with two accidents, and 7 weeks with three accidents. A week is to be selected at random and the number of accidents noted. Let X be the outcome. Then X is a random variable taking on the values 0, 1, 2, and 3. (a) Write out a probability table for X...
A large but sparsely populated county has two small hospitals, one at the south end of the county and the other at the north end. The south hospital's emergency room has four beds, whereas the north hospital's emergency room has only three beds. Let X denote the number of south beds occupied at a particular time on a given day, and let Y denote the number of north beds occupied at the same time on the same day. Suppose that...