Answer:
C.
Step-by-step explanation:
Complementary pairs add up to 90 degrees.
24+66=90.
34+56=90.
Answer:
20 ladies
30 gents
Step-by-step explanation:
Let :
x = number of ladies
50 - x = number of gents
total weight of the ladies = 40x
total weight of the gents = 50(50 - x) = 2500 - 50x
Average weight : (40x +2500 - 50x) / 50 = 46
cross multiply
2500 - 10x = 2300
combine like terms
2500 - 2300 = 10x
200 = 10x
x = 20 = number of ladies
Number of men = 50 - 20 = 30
The AP would be like:
- 1, 3, 5, 7........[50 terms]
Now,
➝ First term = 1
➝ Common difference = 2
➝ No. of terms = 50
By using formula,
Here,
- a = First term
- n = number of terms
- d = common difference
- Sn = sum of n terms
Proceeding further,
➝ S50 = 50/2{ 2 × 1 + (50 - 1)2 }
➝ S50 = 25{ 2 + 49 × 2 }
➝ S50 = 25{ 100 }
➝ S50 = 2500
⛈️ Sum of 50 terms of AP = 2500
Shortcut trick:- n^2
Then, Sum of 50(n) terms = 50^2 = 2500
☘️ Hence, solved !!
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Answer:
Step-by-step explanation:
Given : Total number of students who are asked to complete a survey anonymously : n= 240
Number of students
The proportion report that they have experienced bullying =54
Then , the proportion that students have experienced bullying =
Significance interval :
Critical value :
The confidence interval for the true proportion is given by :-