Khảo sát ngẫu nhiên 196 gia đình trong một khu vực ta thấy chi tiêu trung bình mẫu của một gia đình là 2,56 triệu đồng/tháng và độ lệch chuẩn mẫu là 0,78 triệu đồng/tháng. Hãy xác định khoảng tin cậy
đối xứng 96% cho chi tiêu trung bình của một gia đình trong khu vực này.
♡ (2,4691; 2,6428). B (2,4267; 2,6834). © (2,4456; 2,6744). D (2,4168; 2,6943).

the radius is 2 times the diameter.

step-by-step explanation:

1. sometimes

2.   never

3   .08c = 7.50+.05c   250 pages

step-by-step explanation:

1.   sometimes

the theoretical probability of rolling a 1 is 1/6.   perhaps you got really lucky and never rolled a 1   in those 60 times.   your experimental probability is 0.   or perhaps you rolled a 1   20 times.   your experimental probability is 20/60 is 1/3.     it really just depends on how you rolled in that experiment.

2.   never

the probability of the event occurring is 1.   that is being 100 % sure it will happen.   that is the maximum amount of confidence we have.

3.   no customer card cost:   .08 times number of pages

customer card cost:   7.50 + .05 times number of pages

we want to find when it costs the same amount, so we will set these equal

let c = number of pages

.08c = 7.50+.05c

subtract .05c from each side

.08c-.05c = 7.5+.05c-.05c

.03c=7.5

divide each side by .03

.03c/.03 = 7.5/03

c =250  

the cost is the same at 250 pages

it's possible to build a triangle with side lengths of 3, 3, and 9.- true ( b.)

the answer is  

d.

121π mi^2

hope you got it chief