Answer:
The answer to your question is: 7 7/8 km
Step-by-step explanation:
Data
Lacy runs 5 1/4 km
runs 1 1/2 times as far on Saturday
Km run on Saturday = ?
First calculate 1/2 of 5 1/4 convert 5 1/4 into an improped fraction
5 1/4 = 21/4
Now, divide by two ( 21/4 ) / 2 = 21 / 8
She ran 5 1/4 + 21/8 Solve the sum
= 21/4 + 21/8 = (42 + 21) / 8 = 63 / 8 = 7 7/8 km
Answer:
letter B
Step-by-step explanation:
brainliest please
it's correct!
Porobability distribution of X
x P(x)
0 0.2
1 0.4
2 0.4
Total .1.0
i] Expectation
Mean=Σxp
Variance=x²p-(∑xp)²
thus:
Mean=(0*0.2)+(1*0.4)+(2*0.4)
=0+0.4+0.8
=1.2
ii] Variance
Variance=[(0²*0.2)+(1²*0.4)+(2²*0.4)]-(1.2)²
=[0+0.4+1.6]-1.44
=0.56
hence:
standard deviation=sqrt(0.56)=0.74833
