Which is the population standard deviation of the data set: 8, 9, 10, 11, 12?

Assessment includes a. interviews, recorded conversations, videos, frequency counts, and time samples. b. formal standardized tests and developmental screening tools. c. various types of documented observations, documentation of child work, checklists, rating scales, and standardized tests. d. anecdotal notes, narratives or daily records, daily health checks, and teacher observation checklists.

Driving on the highway can lead you to the hypnosis of a road, a condition of drowsiness or ignorance, you can avoid this condition

How many liters of 60% alcohol solution should be added to 40 liters of a 20% alcohol solution to make a 50% solution?