Complex numbers should be in the form( a + bi) where " a " and " b " need to have explicitly stated values.
For example: { 1 + 1i } is valid whereas { 1 + i } is not. { 0 + 9i } is valid whereas { 9i } is not.
The histogram below represents scores achieved by 250 job applicants on a personality profile.
18. A histogram is skewed to the right( or positively skewed) if it has a single peak and the values of the distribution extend much further to the left of the peak than to the right of the peak.
19. If we draw a straight line through the points in a scatterplot and most of the points fall close to the line, we say that there is a strong linear relationship between the two variables