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Find the population variance of the first 5 natural numbers (1, 2, 3, 4, 5).
A1.5
B2.0
C2.5
D3.0
A can finish a work in 12 days and B can finish it in 18 days. A works alone for 3 days and then B joins him. In how many more days will the work be completed?
A5.4 days
B6 days
C6.5 days
D7 days
In how many different ways can the letters of the word ‘LEADER’ be arranged?
A180
B360
C720
D1440
A train 150 m long passes a telegraph post in 12 seconds. How long will it take to cross a bridge 250 m long?
A20 seconds
B28 seconds
C32 seconds
D35 seconds
The average age of 30 students in a class is 15 years. If the teacher’s age is included, the average increases by 1 year. What is the teacher’s age?
A44 years
B46 years
C48 years
D50 years
Find the median of the data set: 12, 7, 19, 25, 15, 8, 21.
A12
B15
C19
D21
If x : y = 3 : 4, find the value of (5x – 2y) : (7x + 2y).
A7 : 29
B7 : 23
C5 : 29
D11 : 23
If a post of height 6 m casts a shadow 2*sqrt(3) m long, what is the angle of elevation of the sun?
A30°
B45°
C60°
D90°