Answer:
1 in 8; or 12.5% of the time
Step-by-step explanation:
There are eight outcomes. One of eight of those outcomes is a 2.
1/8 = 0.125
20: 30-4 x (2+5)=2
21. 17-(8-5)= 14
22. You put (10/2)-3+1, but it isn't necessary
Explanation: to solve these equations, use PEMDAS (parentheses, exponents, multiplication, division.) these equations don't involve exponents, though, so ignore that part. If 30 is left alone, you would multiply 4x2 before doing anything else. This would mean you would have 30-8+5' which gets you to 27, an incorrect answer. However, if you put parentheses around (2+5), you add those first, meaning you would then have 30-4(2+5) = 30-4(7) = 30-28= 2.
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The correct answer to this is: Y=47
Answer:
Standard Deviation is 18.57 .
Step-by-step explanation:
We are given the frequency distribution for the speed of a sample of automobiles traveling on an interstate highway;
Speed (mph) Frequency (f) X X*f X -
50 - 54 4 52 208 52 - 65 = -13 169
55 - 59 3 57 171 57 - 65 = -8 64
60 - 64 2 62 124 62 - 65 = -3 9
65 - 69 5 67 335 67 - 65 = 2 4
70 - 74 2 72 144 72 - 65 = 7 49
75 - 79 <u> 5 </u> 77 <u> 385 </u> 77 - 65 = 12 144
<u> ∑f = 21 </u> ∑X*<u>f = 1367 </u>
Mean of the data,
=
=
= 65.09 ≈ 65 .
Now, Standard deviation, s =
s =
=
= 18.57
Therefore, standard deviation is 18.57 .