2. The expression of a stationary wave is given by y = 0.3 cos 0.51x sin 60
Where y and x in meters and t is in seconds.
i. Write the expression for two progressive waves resulting the stationary wave above.
ii. Determine the wavelength, frequency, amplitude, and velocity for both progressive waves.
[Ans: 4 m, 30 Hz, 0.15 m, 120 m s']

Please help me i have a test tomorrow and i haven’t sleep yet because of this work

7. see worksheet 1 for values of variables x1, x2 and x3 and answer the following questions: a. for each variable find the mean, median, coefficient of skewness, range and population standard deviation. b. compared to variable x1, how are the mean and median affected by extreme values (outliers) seen in x2 and x3. c. is the median or mean the better measure of location for x2 and x3? explain. d. explain the differences in the magnitudes of the skewness coefficients for the three variables. e. what is the relationship between the range and standard deviation looking across the three variables?