Z = (X-Mean)/SD
<span>z1 = (165 - 150)/15 = +1 </span>
<span>z2 = (135 - 150)/15 = - 1 </span>
<span>According to the Empirical Rule 68-95-99.7 </span>
<span>Mean +/- 1SD covers 68% of the values </span>
<span>100% - 68% = 32% </span>
<span>The remaining 32% is equally distributed below z = - 1 and z = +1 </span>
<span>32%/2 = 16%
</span>
<span>Therefore,
</span>
<span>a) Number of men weighing more than 165 pounds = 16% of 1000 = 160 </span>
<span>b) Number of men weighing less than 135 pounds = 16% of 1000 = 160</span>
Answer:
P (z for -2.23) is -0.9871
Step-by-step explanation:
Given data
mean life x = 753 hours
sample n = 28
mean y = 726
standard deviation SD = 64 hours
to find out
check to have enough evidence to reject his claim
solution
we know that given mean is x ≥ 753
we found mean = 726
so difference = y - x = 726 - 753 = -27
and we know σ = SD/√n = 64 / √28 = 12.094896
Z = y - x / σ
Z = -27 / 12.09
Z = -2.23
so probability value
P (z for -2.23) is -0.9871
so z value is less than alpha = 0.05
so reject
so this is enough evidence to reject his claim
The answer Is c bc u got 6 slides number cubes and number with three letters
Answer: Eric still needs of a deck.
Step-by-step explanation:
You know that:
- Eric need 1/2 deck of playing cards.
- Eric has 2/7 of a deck.
Therefore, to find the fraction of a deck that Eric still needs, you must subtract 1/2 and 2/7:
- Find the least common multiple of the denominators:
- Now, you can make the subtraction:
Therefore, he still needs of a deck.
The mid-point is basically the average of the coordinates. So for the x coordinate do (1+(-7))/2=-3. and for y, do (-10+7)/2=-3/2
This gives you the midpoint as (-3,-3/2)