Everything with a green check mark is correct I just need help with an explanation to solve the Chebyshev interval. Thank you

C https//www.w 6.88/10 Points] DETAILS PREVIOUS ANSWERS BBRIEFSTAT5 3.2.008. MY NOTES PRACTICE ANOTHE Do bonds reduce the overall risk of an investment portfolio? Let x be a random variable representing annual percent return for a certain stock index (all stocks). Let y be a random variable representing annual return for a balanced index (60% stock and 40% bond). For the past several years, we have the following data. x: 14 0 36 21 29 23 24 -14 -11 -22 y: 11 -3 26 15 22 20 16 -3 -1 -10 (a) Compute Ex, Ex2, Ey, Ey2. EX = 100 Ex2 = 4680 Ey = 93 Ey2 = 2281 (b) Use the results of part (a) to compute the sample mean, variance, and standard deviation for x and for y. (Round your answers to two decimal places.) mean 10 9.3 variance 408.89 157.34 standard deviation 20.22 12.54 (c) Compute a 75% Chebyshev interval around the mean for x values and also for y values. (Round your answers to two decimal places.) lower Limit -10.22 X -3.24 X upper Limit 30.22 X 21.84 X Use the intervals to compare the two funds. 75% of the returns for the balanced fund fall within a narrower range than those of the stock fund. 75% of the returns for the stock fund fall within a narrower range than those of the balanced fund. O 25% of the returns for the balanced fund fall within a narrower range than those of the stock fund. O 25% of the returns for the stock fund fall within a wider range than those of the balanced fund. O 78.F Polluted air ~ (4)d' 7:1 9/1