Mathematics, 20.11.2019 08:31 Alexandragurule18
According to a recent report, the average american consumes 22.7 teaspoons of sugar each day (national geographic magazine, august 2013). assuming that the distribution is approximately normal with a stan- dard deviation of s 5 4.5, find each of the following values.
a. what proportion of people consume more than 30 teaspoons of sugar a day?
b. what proportion of people consume at least 20
teaspoons of sugar a day?
20. a recent report indicates that 2-year-old children from well-educated suburban families watched an average of m 5 60 minutes of television each day. assuming that the distribution of television-watching times is normal with a standard deviation of s 5 25 minutes, find each of the following
proportions.
a. what proportion of 2-year-old children watch more than 2 hours of television each day?
b. what proportion of 2-year-old children watch less than 30 minutes a day?
21. a report in 2010 indicates that americans between the ages of 8 and 18 spend an average of m 5 7.5 hours per day using some sort of electronic device such as smart phones, computers, or tablets. as- sume that the distribution of times is normal with a standard deviation of s 5 2.5 hours and find the following values.
a. what is the probability of selecting an individual who uses electronic devices more than 9 hours a day?
b. what proportion of 8- to 18-year-old americans spend between 8 and 12 hours per day using elec- tronic devices? in symbols, p (8 , x , 12) 5 ?
22. seattle, washington, averages m 5 34 inches of an- nual precipitation. assuming that the distribution of precipitation amounts is approximately normal with
a standard deviation of s 5 6.5 inches, determine whether each of the following represents a fairly typi- cal year, an extremely wet year, or an extremely dry year.
a. annual precipitation of 41.8 inches
b. annual precipitation of 49.6 inches
c. annual precipitation of 28.0 inches
Answers: 3
Mathematics, 20.06.2019 18:02
What is the midpoint of the segment below? (-4,-7) (5,6)
Answers: 1
Mathematics, 21.06.2019 17:30
Astore sells two types of radios. one type sells $87 and the other for $119. if 25 were sold and the sales were $2495, how many of the $87 radios were sold a) 5 b) 20 c) 15 d)10
Answers: 2
Mathematics, 21.06.2019 21:30
The measures of the legs of a right triangle are 15m and 20m . what is the length of the hypotenuse
Answers: 1
Mathematics, 21.06.2019 22:00
Ascientist has 50 grams of a radioactive element. the amount of radioactive element remaining after t days can be determined using the equation (1) after two days the scientist receives a second shipment of 50 grams of the same element. the equation used to represent the amount of shipment 2 remaining after t days is 10) - 50 which of the following is an equivalent form of the expression for the amount remaining in shipment 2? what’s the answer?
Answers: 2
According to a recent report, the average american consumes 22.7 teaspoons of sugar each day (nation...
Mathematics, 26.08.2020 23:01
Computers and Technology, 26.08.2020 23:01
Mathematics, 26.08.2020 23:01
Business, 26.08.2020 23:01
English, 26.08.2020 23:01
Mathematics, 26.08.2020 23:01
History, 26.08.2020 23:01
Mathematics, 26.08.2020 23:01
Chemistry, 26.08.2020 23:01
Spanish, 26.08.2020 23:01
Mathematics, 26.08.2020 23:01
Mathematics, 26.08.2020 23:01