Numerical characteristics

Lessons 39 · 1 lessons · Sh.A. Alimov, A.R. Xalmukhamedov, M.A. Mirzaakhmedov. Algebra: textbook for Grade 9 of general secondary schools. Revised 4th edition. Tashkent: “O‘qituvchi”, 2019

Answers are for parents and teachers.

Find the range of the sample −3, 4, −7, 10.

Find the mean of the sample 5, 7, 8, 12, 13.

Find the variance of the sample 2, 5, 8.

X takes the values 1, 2, 5 with probabilities 1/2, 3/10, 1/5. Find E.

For a sample of heights (cm), D = 25. Find σ and its unit.