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General
Justin and Elena each launched a toy rocket into the air. The height of Justin’s rocket is modeled by the equation h = –16t2 + 60t + 2. Elena launched his rocket from the same position, but with an initial velocity double that of Justin’s. Which equation best models the height of Elena’s rocket? h(t) = at2 + vt + h0 h = –16t2 + 60t + 4 h = –32t2 + 120t + 4 h = –32t2 + 60t + 2 h = –16t2 + 120t + 2
General
5 months ago
A pair of crocs was purchases for $25. After 3 years the crocs have a value of $3. On average, theowner of the crocs wore them for 350 days per year during those 3 years. The depreciation in the valueof the crocs, per day walked in, is closest toA. 2 centsB. 3 centsC. 4 centsD. 5 centsE. 6 cents
General
5 months ago
Roberto needs 10 kilograms of clay for a ceramics project. He already has three pieces that weigh 1.3 kg, 2.4 kg, and 0.9 kg. How much more clay does he need?
General
5 months ago
Andy and alex order prints andy orders 40 small and 10 large for 32.50 and alex orders 20 small and 8 large for 20. How much does small and large prints cost
General
5 months ago
A father and his daughter are interested in the same baseball game. The father sits next to his radio at home and listens to the game; his daughter attends the game and sits in the outfield bleachers. In the bottom of the ninth inning a home run is hit. If the father’s radio is 132 km from the radio station, and the daughter is 115 m from home plate, who hears the home run first? (Assume that there is no time delay between the baseball being hit and its sound being broadcast by the radio station). In addition, let the speed of sound in the stadium be 343 m>s.
General
5 months ago
What is the probability that a sample of 50 male graduates will provide a sample mean within $.50 of the population mean, $21.68? b. What is the probability that a sample of 50 female graduates will provide a sample mean within $.50 of the population mean, $18.80? c. In which of the preceding two cases, part (a) or part (b), do we have a higher probability of obtaining a sample estimate within $.50 of the population mean? Why? d. What is the probability that a sample of 120 female graduates will provide a sample mean more than $.30 below the population mean?
General
5 months ago
An Izod impact test was performed on 20 specimens of PVC pipe. The sample mean is x Overscript bar EndScripts equals 1.14 and the sample standard deviation is s = 0.28. Find a 99% lower confidence bound on the true Izod impact strength. Assume the data are normally distributed. Round your answer to 3 decimal places. Entry field with incorrect answer 1.319 less-than-or-equal-to
General
5 months ago
The Rockwell hardness of a metal is determined by impressing a hardened point into the surface of the metal and then measuring the depth of penetration of the point. Suppose the Rockwell hardness of a particular alloy is normally distributed with mean 68 and standard deviation 3. (a) If a specimen is acceptable only if its hardness is between 65 and 71, what is the probability that a randomly chosen specimen has an acceptable hardness? (Round your answer to four decimal places.) 0.6826 Correct: Your answer is correct.
General
5 months ago
Jolyn, a golfer, claims that her drive distance is not equal to 222 meters, on average. Several of her friends do not believe her, so she decides to do a hypothesis test, at a 5% significance level, to persuade them. She hits 11 drives. The mean distance of the sample drives is 218 meters. Jolyn knows from experience that the standard deviation for her drive distance is 14 meters. H0: μ=222; Ha: μ≠222 α=0.05 (significance level) What is the test statistic (z-score) of this one-mean hypothesis test, rounded to two decimal places? Provide your answer below:
General
5 months ago
A sanitation department is interested in estimating the mean amount of garbage per bin for all bins in the city. Assume the amount of garbage per bin is normally distributed. In a random sample of 40 bins, the sample mean amount is 52.8 pounds and the population standard deviation is 3.9 pounds. Construct 95% and 99% confidence intervals for the mean amount of garbage per bin for all bins in the city. Don't use 68/95/99.7 rule; instead use R to compute the quantities such as quantiles.
General
5 months ago
Solve for x. 3^x−1=9^x+2 Enter your answer in the box. x =
General
5 months ago
30 POINTS!!! Calculate the percent increase or decrease between the starting and ending quantities below. Round your answer to one decimal place.1) Start: 3 End: 102) Start: 9 End: 203) Start: 100 End: 85
General
5 months ago
A personnel researcher has designed a questionnaire and she would like to estimate the average time to complete the questionnaire. Suppose she samples 100 employees and finds that the mean time to take the test is 27 minutes with a standard deviation of 4 minutes. Construct a 90% confidence interval for the mean time to complete the questionnaire. Also, write a short explanation about the findings to the human resources director of your company summarizing the results. Use Excel for this analysis.
General
5 months ago
A new type of fertilizer is being tested on a plot of land in an orange grove, to see whether it increases the amount of fruit produced. The mean number of pounds of fruit on this plot of land with the old fertilizer was 409 pounds. Agriculture scientists believe that the new fertilizer may decrease the yield. State the appropriate null and alternate hypothesesa. The null hypothesis is ____________b. The alternate hypothesis is ___________
General
5 months ago
A survey was conducted that asked 997 people how many books they had read in the past year. Results indicated that x overbar equals 13.2 books and sequels 18.9 books. Construct a 95 % confidence interval for the mean number of books people read. Interpret the interval.
General
5 months ago
A hospital has a large tank with a dimension shown. The tank does not have a cover. What is the surface area of the fish tank.
General
5 months ago
There are 482 studemts in the school and there are two Grade 4 classes: Ms.Ashley's and Mr.Ben's classes. Mrs. Aheley's class had 15 boays and 6 girls. Mr Ben's class ahd 14 girls and 10 boys. In Ms. Ashley's class, 2/3 of the students wear glasses. In Mr. Ben's class, 1/4 of the kids have others siblings in the school.1. What fraction of the students in the school are in grade 4?2. What fraction of the grade 4 students are boys?3. What fraction of the grade 4 students are in Ms. Ashley's class?4. What fraction of the students in Mr. Ben's class that do not have siblings in the same school?5. In Ms. Ashley's class, are there more students that wear glasses or do not wear glasses?
General
5 months ago
99 POINTS!Find the standard deviation for the binomial distribution.n=21; p=0.2A) 1.83B) 5.95C) -0.58D) 5.10
General
5 months ago
How does the value of 30,000 x (4 x 3) compare to the value of 300 x (4 x 3)?
General
5 months ago
HELP I NEED YOUR HELP MATH ONE PROBLEM 10 POINTS HELP
General
5 months ago
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