The standard deviatiion is the square root of the variance.
Answer:
300 is the student strength of the school
Step-by-step explanation:
99 of total students=33%
total students=99*100/33
total student=9900/33
total student=300 students
Step-by-step explanation:
hope it helps.........
Answer: 0.923
Step-by-step explanation:
Let A be the event an Internet user posts photos that they have taken themselves, and B be the event an Internet user posts videos that they have taken themselves.
Pew Research Center finds that
P(A)=0.52 P(b)=0.26, and P(A or B)=0.54.
To find : P(A|B)
Since , 
i.e. 

Now, using conditional probability formula ,

Hence, the conditional probability that an Internet user posts photos that they have taken themselves, given that they post videos that they have taken themselves = 0.923
The ratio 1:2 means there are twice as many dimes as there are quarters. An expression could be n=2d, n being number of quarters, d being number of dimes.