# A+ answers | Mathematics homework help

1. Assume the urge of vehicles acrave a elongate of I-10 has an almost typical classification after a while a moderation of 71 mph and a scale intermission of 8 mph.

a. The ordinary urge period is 65 mph. What is the symmetry of vehicles short than or resembling to the urge period?

b. What symmetry of the vehicles would be going short than 50 mph?

c. A new urge period allure be initiated such that almost 10% of vehicles allure be balance the urge period. What is the new urge period established on this proof?

d. In what way do you fancy the direct classification of urges differs from a typical classification?

2. A order of students at a train takes a fact experiment. The classification is typical after a while a moderation of 25, and a scale intermission of 4.

(a) Everyone who beaks in the top 30% of the classification gets a certificate. What is the mediumest beak someone can get and quiet obtain a certificate?

(b) The top 5% of the beaks get to emulate in a saywide fact challenge. What is the mediumest beak someone can get and quiet go onto emulate after a while the tranquillity of the say?

3. Use the typical classification to abut the binomial classification and meet the presumption of getting 15 to 18 heads out of 25 flips. Compare this to what you get when you count the presumption using the binomial classification. Transcribe your answers out to four decimal places.

4. The enduring regaining era from a point surgical process is typically nice after a while a moderation of 5.3 days and a scale intermission of 2.1 days. What is the median regaining era? a. 2.7 b. 5.3 c. 7.4 d. 2.1

5. Acme and moment are two measurements used to vestige a offshoot’s product. The World Health Organization measures offshoot product by comparing the moments of offshootren who are the selfselfsimilar acme and the selfselfsimilar gender. In 2009, moments for all 80 cm girls in the relation population had a moderation μ = 10.2 kg and scale intermission σ = 0.8 kg. Weights are typically nice. X ~ N(10.2, 0.8). Count the z-scores that tally to the aftercited moments and expone them.

a. 11 kg

b. 7.9 kg

c. 12.2 kg

6. In China, four-year-olds mean three hours a day unsupervised. Most of the unsupervised offshootren subsist in pastoral areas, considered impregnable. Suppose that the scale intermission is 1.5 hours and the quantity of era departed singular is typically nice. We aimlessly choice one Chinese four-year-old buttress in a pastoral area. We are assiduous in the quantity of era the offshoot squanders singular per day.

a. In direction, designate the aimnear capricious X.

c. Meet the presumption that the offshoot squanders short than one hour per day unsupervised. Sketch the graph, and transcribe the presumption sayment.

d. What percent of the offshootren squander balance ten hours per day unsupervised?

e. Seventy percent of the offshootren squander at smallest how crave per day unsupervised?

On mean, 28 percent of 18 to 34 year olds curb their Facebook profiles precedently getting out of bed in the waking. Suppose

this percentage follows a typical classification after a while a scale intermission of five percent.

a. Meet the presumption that the percent of 18 to 34-year-olds who curb Facebook precedently getting out of bed in the

waking is at smallest 30.

b. Meet the 95th percentile, and direct it in a judgment.