The answer is indeed D. If you check the normal distribution curve you get that within 1 standard diviation its
34%+34%=68%
Within 2 it's 34+34+13.5+13.5= 95%
And within 3 it's 34+34+13.5+13.5+2.5+2.5=100%
Answer:
The table in blue
Step-by-step explanation:
Answer:
50%
Step-by-step explanation:
From sin(a-b) = sin(a)cos(b) - cos(a)sin(b)
let a=9x, b=x
sin(9x)cos(x) - cos(9x)sin(x) = sin(9x-x) = sin(8x)
Answer:
Step-by-step explanation:
Given :
l + m + n = 9
l²+ m² + n²= 31
l + m + n = 9
On squaring both sides
(l + m + n)²= 9²
(l²+m²+n²+2(lm+mn+nl) = 81
31 +2(lm+mn+nl) = 81
2(lm+mn+nl) = 81 - 31
2(lm+mn+nl) = 50
(lm+mn+nl) = 50/2
(lm+mn+nl) = 25
Hence, the value of (lm+mn+nl) = 25
