Answer:
Step-by-step explanation:
Answer:
4x - 12 = 28
To isolate 4x, we add 12 to both sides:
4x - 12 + 12 = 28 + 12
so
4x = 40
Now we divide 4 from both sides:
x = 40 / 4
so x = 10
Old
9.99×55
=549.45
New
10.68×55
=587.4
((10.68÷9.99)−1)×100
=6.9%
Answer:
cos (x)=8/17
Step-by-step explanation:
Answer:
Step-by-step explanation:
Mean weigth is 3.8
standard deviation 15 =0.5
sd2 =15*(sd₁₅ )²
sd=(15*0.25)^0.5
sd=1.94
z=(3.8-4)/((0.5)/15^0.5)
z=-1.55
p=0.060571
0.060571>.05
true mean weight is less than 4 ounces
test statistic= (sample mean-mean)/((sd of sample)/n^0.5)
test statistic=(3.8-4)/((0.5)/15^0.5)
test statistic=-1.55
