Cho phương trình dao động x = 4×cos(4×π×t + π÷2)∧cm a)cho biết biên độ pha ban đầu tần số góc
b)tình tần số, chu kỳ
c)tính li độ tại t=0.25 (s)

solution:

as, mean is defined as sum of all the observations divided by total number of observations.

and , median is mid value of the data whether arranged in ascending order or descending order.

consider, roadsters:

2,3,4,5,6,7,8,9

mean =

also, median= , because number of observations is even, so median is mean of two mid values.

now, coming to bandits

2,3,4,5,6

mean =  

median = 4, as number of observations is odd.

so, roadsters has greater median as well mean than bandits.

→option a is true about the repairs performed on 2 types of cars:

bandits have lower median and mean than roadsters.

addition

step-by-step explanation:

3 3 6, because in every triangle the longer side is always shorter than the sum of the other two

answer is  

c.

36

step-by-step explanation: