Use trigonometry.
sinQ = 14/50 = 0.28
-> angle Q = sin^-1(0.28) = approx 16 degrees
-> cosQ = A/H -> cos16 = PQ/50
=> PQ = 50*cos16 = approx 48.06
So yea.
Answer:
To calculate the mean we need x and f both
x = 180° - 67° - 52°
x = 61°
So, the value of x is 61°
