Khảo sát ngẫu nhiên 400 trái của một loại trái cây, người ta thấy có 180 trái loại I. Nếu cho rằng tỉ lệ trái loại I là 50% thì có chấp nhận được không, với mức ý nghĩa 5%? Yêu cầu tính giá trị kiểm định và đưa ra nhận xét.

Write the sine and cosine values of a, b, respectively, in the figure for (1) and (2) + explanation.

3women sell hats at a craft fair weekly. the money they make at the fair is split into categories. 9% goes to pay taxes. $55 goes to pay rent for the space they sell in. the rest is split between the women. if the group make $706 at the fair, how much does each women get paid once the money is divided

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of