Sắp xếp số liệu theo thứ tự từ nhỏ đến lớn, xác định được Xmax = 145, Xmin = 50. Với khoảng cách tổ bằng nhau và bằng 10, bảng tần số phân bố được xây dựng như sau:
Năng lượng tiêu dùng
(triệu BTU) Tần số (hộ) Tần suất (lần)
50 – 60 8 0,16
60 – 70 7 0,14
70 – 80 3 0,06
80 – 90 6 0,12
90 – 100 10 0,20
100 – 110 5 0,10
110 – 120 4 0,08
120 – 130 2 0,04
130 – 140 3 0,06
140 – 150 2 0,04
Tổng 50 1,00
Từ đó tính được tần suất theo công thức di= fi/∑ fi

Which of these terms are associated with communication between neurons? chemical signals, electrical signals, synapse chemical signals, synapse, neurotransmitters synapse, electrical signals, chemical signals synapse, electrical signals, neurotransmitters

Which of the following must happen in order for productivity to increase? a. production levels remain unchanged while inputs increase. b. production levels rise while inputs decrease. c. production levels fall while inputs increase.

In δabc shown below, bd over ba equals be over bc: triangle abc with segment de intersecting sides ab and bc respectively. the following flowchart proof with missing statements and reasons proves that if a line intersects two sides of a triangle and divides these sides proportionally, the line is parallel to the third side: top path, by given the ratio of line segments bd to ba is equal to the ratio of line segments be to bc. by space labeled by 2, space labeled by 1 occurs. by corresponding parts of similar triangles, angle bde is congruent to angle bac. by converse of the corresponding angles postulate, line segment de is parallel to line segment ac. bottom path, by reflexive property of quality, angle b is congruent to angle b. by space labeled by 2, space labeled by 1 occurs. by corresponding parts of similar triangles, angle bde is congruent to angle bac. by converse of the corresponding angles postulate, line segment de is parallel to line segment ac. which reason can be used to fill in the numbered blank space? 1. δabc ~ δbed 2. side-angle-side similarity postulate 1. δabc ~ δbed 2. side-side-side similarity theorem 1. δabc ~ δdbe 2. side-angle-side similarity postulate 1. δabc ~ δdbe 2. side-side-side similarity theorem