Divide 2 by 5 then convert the decimal to percent by multiply by 100 and adding the % symbol:

\(\displaystyle\frac{{2}}{{5}}={0.4}={40}\%\)

\(\displaystyle\frac{{2}}{{5}}={0.4}={40}\%\)

Question

asked 2020-10-28

A bag contains red and blue marbles. Given that \frac{17}{20} of the marbles are red, what percent of the marbled are blue?

asked 2020-10-20

Lisa spends 3 hours driving to and from work each work day. What percent of her day does she spend driving to and from work, each work day?

asked 2021-02-10

A salesperson earns $50 a day plus 12% commission on sales over $200. If her daily earnings are $76.88, how much money in merchandise did she sell?

asked 2020-11-26

Use either the critical-value approach or the P-value approach to perform the required hypothesis test. For several years, evidence had been mounting that folic acid reduces major birth defects. A. Czeizel and I. Dudas of the National Institute of Hygiene in Budapest directed a study that provided the strongest evidence to date. Their results were published in the paper “Prevention of the First Occurrence of Neural-Tube Defects by Periconceptional Vitamin Supplementation” (New England Journal of Medicine, Vol. 327(26), p. 1832). For the study, the doctors enrolled women prior to conception and divided them randomly into two groups. One group, consisting of 2701 women, took daily multivitamins containing 0.8 mg of folic acid, the other group, consisting of 2052 women, received only trace elements. Major birth defects occurred in 35 cases when the women took folic acid and in 47 cases when the women did not. a. At the 1% significance level, do the data provide sufficient evidence to conclude that women who take folic acid are at lesser risk of having children with major birth defects? b. Is this study a designed experiment or an observational study? Explain your answer. c. In view of your answers to parts (a) and (b), could you reasonably conclude that taking folic acid causes a reduction in major birth defects? Explain your answer.

asked 2020-12-30

A ream of paper contains 500 sheets of paper. Norm has 373 sheets of paper left from a ream. Express the portion of a ream Norm has as a fraction and as a decimal.

asked 2020-11-26

Airlines schedule about 5.5 hours of flying time for an A320 Airbus to fly from Dulles International Airport near Washington, D.C., to Los Angeles International Airport. Airlines schedule about 4.5 hours of flying time for the reverse direction. The distance between these airports is about 2,300 miles. They allow about 0.4 hour for takeoff and landing.

a. From this information, estimate (to the nearest 5 mph) the average wind speed the airlines assume in making their schedule.

b. What average airplane speed (to the nearest 5 mph) do the airlines assume in making their schedule?

a. From this information, estimate (to the nearest 5 mph) the average wind speed the airlines assume in making their schedule.

b. What average airplane speed (to the nearest 5 mph) do the airlines assume in making their schedule?

asked 2021-01-08

Which of these are propositions? What are the truth values of those that are propositions? a) Do not pass go. b) What time is it? c) There are no black flies in Maine. d) 4 + x = 5. e) The moon is made of green cheese. f) \(\displaystyle{2}≥{100}\). g) Kochi is the capital of Kerala state. h) 2 + 3 = 5. i) 5 + 7 = 10. j) Answer this question.

asked 2021-02-27

On a recent day, a Euro was equal to about 1.2 American dollars. Write an expression which estimates the number of dollars in x Euros. Then estimate the number of American dollars equal to 25 Euros.

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A chef has one cheese that contains 45% fat and another cheese that contains 20% fat. How many grams of each cheese should she use in order to obtain 30 grams of a cheese mixture that is 30% fat?

asked 2020-10-23

Researchers wanted to compare the effectiveness of a water softener used with a filtering
process with a water softener used without filtering. Ninety locations were randomly divided into two groups of equal size. Group A locations used a water softener and the filtering process, while group B used only the water softener.
At the end of three months, a water sample was tested at each location for its level of softness.
(Water softness was measured on a scale of 1 to 5, with 5 being the softest water.)
The results were as follows:
Group A (water softener and filtering)
\(\displaystyle{x}_{{1}}={2.1}\)

\(\displaystyle{s}_{{1}}={0.7}\) Group B (water softener only) \(\displaystyle{x}_{{2}}={1.7}\)

\(\displaystyle{s}_{{2}}={0.4}\) Determine, at the 90% confidence level, whether there is a difference between the two types of treatments.

\(\displaystyle{s}_{{1}}={0.7}\) Group B (water softener only) \(\displaystyle{x}_{{2}}={1.7}\)

\(\displaystyle{s}_{{2}}={0.4}\) Determine, at the 90% confidence level, whether there is a difference between the two types of treatments.