<span> 82+ 90+78+100 = 350
</span><span>Tim wants to have a test average of 90% on all of his 6 tests then
</span>90 x 6 = 540
540 - 350 = 190
<span> the average of Tim’s next two tests = 190 / 2 = 95
answer
</span><span>average of Tim’s next two tests must be 95</span>
We know that the sum is 30
that means that jody's older brother is 3 years less than twice jodys age.
Lets try all the answers
7*2= 14-3=11 Nope
11*2=22-3=19+11=30 YUP!
19*2=35-3=32 Nope
23*2=46-3=43 Nope
Your answer is b
Answer:
The probability that the average age of a randomly selected sample of 100 students will be less than 21.8 years is 0.159
Step-by-step explanation:
According to the given data we have the following:
mean = μ= 22
standard deviation = σ = 2
n = 100
μx = 22
σx=σ/√n=2/√100=0.2
Therefore, P( x < 21.8)=P(x-μx)/σx<(21.8-22)/0.2
=P(z<-1)
= 0.159
The probability that the average age of a randomly selected sample of 100 students will be less than 21.8 years is 0.159
