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hjlf
2 years ago
9

Evaluate the following expression: (3 · 3)2 - 23

Mathematics
2 answers:
ycow [4]2 years ago
5 0
3 times 3 equals 9 and 2-23 equals 21

or you’re probably distributing so 3 times 2 equals 6 now 3 times 3 times -23 equals -69
basically the same thing all over again so sorry I tried to help
Kruka [31]2 years ago
4 0
This is really hard I’m going to help you just let me do the work
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The physical plant at the main campus of a large state university recieves daily requests to replace florecent lightbulbs. The d
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Answer:

50%

Step-by-step explanation:

68-95-99.7 rule

68% of all values lie within the 1 standard deviation from mean (\mu-\sigma,\mu+\sigma)

95% of all values lie within the 1 standard deviation from mean  (\mu-1\sigma,\mu+1\sigma)

99.7% of all values lie within the 1 standard deviation from mean  (\mu-3\sigma,\mu+3\sigma)

The distribution of the number of daily requests is bell-shaped and has a mean of 55 and a standard deviation of 4.

\mu = 55\\\sigma = 4

68% of all values lie within the 1 standard deviation from mean (\mu-\sigma,\mu+\sigma) = (55-4,55+4)= (51,59)

95% of all values lie within the 2 standard deviation from mean  (\mu-1\sigma,\mu+1\sigma)= (55-2(4),55+2(4))= (47,63)

99.7% of all values lie within the 3 standard deviation from mean  (\mu-3\sigma,\mu+3\sigma)= (55-3(4),55+3(4))= (43,67)

Refer the attached figure

P(43<x<55)=2.5%+13.5%+34%=50%

Hence The approximate percentage of light bulb replacement requests numbering between 43 and 55 is 50%

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