Bài : Đo chỉ số mỡ sữa x ( tính theo %) của 130 bà mẹ sinh con ta được bảng số liệu:
Tìm các tham số của mẫu:
Mod(X);
2 2 2
X ; X ; S ; S ;S ' ; S '
x x x x

Chỉ số mỡ sữa dưới 4,2 thuộc loại tốt . Hãy tỉ lệ
ft
chỉ số mỡ
sữa tốt với độ tin cậy 98%.
Bài làm

Chỉ số [3,0 – 3,6) [3,6 – 4,2) [4,2 – 4,8) [4,8 – 5,4) [5,4 – 6,0) [6,0 – 6,6) [6,6 – 7,2)
mỡ sữa
Số bà mẹ 2 8 35 43 22 15 5

Complete the steps, which describe how to find the area of the shaded portion of the circle. find the area of the sector by multiplying the area of the circle by the ratio of the to 360. subtract the area of the triangle from the area of the sector.

Given: ∆mop p∆mop =12+4 3 m∠p = 90°, m∠m = 60° find: mp, mo

Titus works at a hotel. part of his job is to keep the complimentary pitcher of water at least half full and always with ice. when he starts his shift, the water level shows 4 gallons, or 128 cups of water. as the shift progresses, he records the level of the water every 10 minutes. after 2 hours, he uses a regression calculator to compute an equation for the decrease in water. his equation is w –0.414t + 129.549, where t is the number of minutes and w is the level of water. according to the equation, after about how many minutes would the water level be less than or equal to 64 cups?