Question

Plz help me with this

Answer 1

Answer: mean = 3.6, standard deviation = 3

Explanation:

`\text{Mean: }(90* 4)/(100)=(360)/(100)=3.6\\\\\\\text{Standard Deviation: }\\\bullet n=100\qquad \rightarrow \text{number of students}\\\bullet p=0.9\qquad \rightarrow \text{probability of success}\\\bullet q=0.1\qquad \rightarrow \text{probability of failure}\\\\SD=√(n* p* q)\\.\quad =√((100)(0.9)(0.1))\\.\quad =√(9)\\.\quad =3`