Nakita

Scores on a test are normally distributed and have a mean of 75 and a standard deviation of 4.2. What score does a student need in order to rank in the top 20%?

The following data represent the​ high-temperature distribution for a summer month in a city for some of the last 130 years. Treat the data as a population. TemperatureTemperature ​50-59 ​60-69 ​70-79 ​80-89 ​90-99 ​100-109 DaysDays 1 309 1433 1521 412 14...