Answer:
416
Step-by-step explanation:
Standard deviation is 2.6
Margin error for the problem is 0.25
Probability 95%, that means thet the siginficance level α is 1 – p
α = 1 – 0.95 = 0.05
margin of error (ME) can be defined as follows
ME = Z(α/2) * standard deviation/ √n
Where n is the sample size
Z(0.05/2) = Z(0.025)
Using a z table Z = 1.96
Now, replacing in the equation and find n
.25 = 1.96 * 2.6/ √n
0.25 = 5.096/√n
√n = 5.096 /0.25
√n = 20.38
n = 20.38^2
n = 415.5 = 416
Answer:
35
Step-by-step explanation:
35
Yes because if yuo add 12 more your adding 12 more of students to make 24
