An amount of €7,800 is made up with the notes of the nominations €100, €50, €20 and €10. The number of €10 notes are 2 times a number of €20 notes. The number of €20 notes are 3 times the number of €50. The number of €50 notes are 4 times the number of €100 notes. How many total laws are how many total notes of denomination denomination €100 are there?​

For a science project, a high school research team conducted a survey of local air temperatures. based on the results of the survey, the found that the average temperatures were around 10 degrees higher than expected. this result was wrong. the trouble with the survey was that most of the locations were exposed to direct sunlight and located over asphalt or sand, which resulted in higher temperatures than normal. this is a classic example of an error in which phase of inferential statistics?