Khalid is of North African descent. He has abnormal blood cells which result in his feeling listless. He also appears pale and has a low resistance to infections. He is short for hisage. Which of the following disorders does Khalid most likely have?

The standard deviation is an average that is calculated by adding up a set of quantities and dividing the sum by the total number of quantities in the set

Indicate whether this statement is true or false.

__________ refers to how accurately we perceive visual information

Fill in the blanks with correct word