The manager of a dress shop recorded the number of dresses sold during the week the data is as follows

17 15 16 20 15 19

Find the mean deviation for this data

4.98

1.67

2.21

1.91

2.6925 is the mean/ avg you add all the numbers and divide by the amount of numbers you added

Answer to your question: a. the fundamental theorem of algebra tells you that the equation will have two complex roots since the degree of the polynomial is 2. the roots are ​ x=1±i7√2 .number of roots=degree of polynomialhere, degree of polynomial is 2 so number of roots will be 2.hope it *_*