There are 10 boys and 20 girls in a class.
The class has a test.
The mean mark for all t...
Mathematics, 16.03.2020 23:00 nourmaali
There are 10 boys and 20 girls in a class.
The class has a test.
The mean mark for all the class is 60.
The mean mark for the girls is 54.
Work out the mean mark for the boys.
Answers: 3
Mathematics, 21.06.2019 21:30
In a test for esp (extrasensory perception), a subject is told that cards only the experimenter can see contain either a star, a circle, a wave, or a square. as the experimenter looks at each of 20 cards in turn, the subject names the shape on the card. a subject who is just guessing has probability 0.25 of guessing correctly on each card. a. the count of correct guesses in 20 cards has a binomial distribution. what are n and p? b. what is the mean number of correct guesses in 20 cards for subjects who are just guessing? c. what is the probability of exactly 5 correct guesses in 20 cards if a subject is just guessing?
Answers: 1
Mathematics, 22.06.2019 00:50
Randy and trey take turns cleaning offices on the weekends. it takes randy at most 4 hours to clean the offices. it takes trey at most 6 hours to clean the offices. what is the greatest amount of time it would take them to clean the offices together? 2.4 hours 2.5 hours
Answers: 3
Mathematics, 22.06.2019 01:00
Given the net of the rectangular prism, what is its surface area?
Answers: 1
Chemistry, 23.06.2021 06:00
Social Studies, 23.06.2021 06:10
Chemistry, 23.06.2021 06:10
Chemistry, 23.06.2021 06:10
Mathematics, 23.06.2021 06:10
Social Studies, 23.06.2021 06:10
Social Studies, 23.06.2021 06:10
English, 23.06.2021 06:10
History, 23.06.2021 06:10
Social Studies, 23.06.2021 06:10
Social Studies, 23.06.2021 06:10
Biology, 23.06.2021 06:20
Mathematics, 23.06.2021 06:20