### Delivery time for packages

Assignment Help Basic Statistics
##### Reference no: EM1393540

Express Courier Service has found that the delivery time for packages is normally distributed, with mean 13 hours and standard deviation 2 hours.

a) For a package selected at random, what is the probability that it will be delivered in 18 hours or less? (Round your answer to four decimal places.)

b) What should be the guaranteed delivery time on all packages in order to be 90% sure that the package will be delivered before this time? (Hint: Note that 10% of the packages will be delivered at a time beyond the guaranteed time period.) (Round your answer to one decimal place.)

### Previous Q& A

#### Confidence interval for the average number of hours

A market researcher wants to find the 99% Confidence Interval for the average number of hours people spend online each day.

#### Determine the z-transforms and sketch the roc

Design a digital Chebyshev-II filter and determine the coefficients of the impulse response h(n) of the FIR filter and Determine the Z-transforms and sketch the ROC

#### Chi-square test statistic and table value

The calculated chi-square test statistic and the table value for a 0.05 significance level are:

#### Randomized block design

A randomized block design with 4 treatments and 5 blocks produced the following sum of squares values: SST = 1951, SSTR = 349, SSE = 188. The value of SSB must be:

#### Find the maximum total number of rfus

A student analyze 5,000 RFUs in a 200ul aliquot from a G3-500 ml culture. How many total RFUs will be present in a G3-15ml sample? During rGFP purification in lab#4.

#### Effect of a level for one factor depends on which level

When the effect of a level for one factor depends on which level of the other factor is present, use: Select one:

#### Maximum rate of inappropriate spontaneous phospholipid flips

Plasma membrane with surface area of 5000 µm2; there are 106 phospholipid molecules per µm2 in each leaflet of the membrane; there are 3000 molecules of flippase enzyme associated with plasma membrane.

#### Probability that person actually has heart disease

If the test is positive, what is the probability that this person actually has heart disease?

#### Yield of income and growth mutual funds

A financial planner wants to compare the yield of income and growth mutual funds. Fifty thousand dollars is invested in each of a sample of 35 income and 40 growth funds

#### Explain the structure of a flagellum

Explain the structure of a flagellum and how it operates and what are the four main types of flagellar arrangement?

### Similar Q& A

#### Determining confidence interval for mean growth rate

Bougainvilleas, mean growth rate was 2.23 inches/week and sample standard deviation was 0.77 inches/week. Determine a 90% confidence interval for mean growth rate of all Bougainvilleas.

#### Finding p-value for specific level of significance

At the .05 level of significance, can we conclude that those joining Weight Reducers on average will lose less than 10 pounds? Determine the  p -value.

#### Why is a normal distribution called normal

Why is a normal distribution called "normal"? Investigate the answer to this question on the internet and share the answer in your own words. Be sure to cite your sources.

#### Constructing confidence interval

Construct a 95 percent confidence interval for the population mean. Is it reasonable that the population mean is 28 weeks? Justify your answer.

#### Random samples taken from the same population

Do you think that all random samples taken from the same population will lead to the same result?

#### Determining population percentage by level of significance

Does this result support original claim, or is population percentage considerably less than 45%. Use alpha=.05 for level of significance.

#### Sample of southern phone company subscribers

A survey of the number of calls received by a sample of Southern Phone Company subscribers last week revealed the following information.

#### Computing cumulative probabilities of numbers

Compute cumulative probabilities for these numbers in second column. Then create a histogram illustrating data distribution. Using generated Normal probability table, determine probability of  Pr(X

#### Tossing a coin six times

I tossed a coin 6 times and recorded the outcomes - H for heads and T for tails. The first set of tosses yielded HTHTTH and the second set of tosses yielded TTTHHH. Which set of tosses is more probable to happen? And why?

#### Pearson product-moment correlation coefficient

Critical Thinking: Discuss the implications of: magnitude (from 0 to 1); sign ( + or -); and probability versus causality for the Correlation Coefficient (also known as the Pearson Product-Moment Correlation Coefficient).

#### Computing standard deviation

A manufacturing process makes items whose weights are normally distributed. It is known that 22.57% of all the items made weigh between 100 grams up to mean and 49.18% weigh from the mean up to 190 grams. Find out the standard deviation.

#### What is the possibility that x is greater than 30

Probability using discrete distribution.The probability distribution for the random variable x follows.