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zysi [14]
3 years ago
15

If a man take one and a half mins to paint a door how much doors can he paint in seven half hour

Mathematics
1 answer:
sashaice [31]3 years ago
7 0

Answer:

300 doors.

Step-by-step explanation:

1.5 minutes for 1 door.

7.5 hours for 300 doors.

7.5 hours = 450 minutes.

\frac{450}{1.5}=300

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The data list shows the scores of ten students in Mr. Smith's math class. 61, 67, 81, 83, 87, 88, 89, 90, 98, 100 What is the st
cluponka [151]

Answer:

12.3

Step-by-step explanation:

Step 1

We find the mean

The data list shows the scores of ten students in Mr. Smith's math class. 61, 67, 81, 83, 87, 88, 89, 90, 98, 100

Mean = Sum of terms/Number of terms

Number of terms = 10

Mean = 61 + 67 + 81 + 83 + 87 + 88 + 89 + 90 + 98 + 100/10

Mean = 844/10

Mean = 84.4

Step 2

Standard deviation

The formula for sample standard deviation =

√(x - Mean)²/n - 1

= √[(61 - 84.4)² + (67 - 84.4)² + (81 - 84.4)² + (83 - 84.4)² + (87 - 84.4)² + (88 - 84.4)² + (89 - 84.4)² + (90 - 84.4)² + (98 - 84.4)² + (100 - 84.4)²]/10 - 1

=√ 547.56 + 302.76 + 11.56 + 1.96 + 6.76 + 12.96 + 21.16 + 31.36 + 184.96 + 243.36/10 - 1

= √1364.4/9

= √151.6

= 12.31259518

Approximately to the nearest tenth = 12.3

The standard deviation = 12.3

6 0
3 years ago
maya wants to mark a length of 7 inches on a sheet of paper, but she does not have a ruler . she has pieces of wood that are 4 i
Vladimir79 [104]
Ok
6+1=7
if only we could find 1
hmm

4+1=5
so mark a starting line
put the 4 inch and 5 inch wood at that line, facing the same direction (lying flat on paper)
the difference between the pieces of wood is 1 inch
mark the end of the 5 inch and the end of the 4 inch
that is 1 inch
now pick either end of that 1 inch mark and measure 6 inches more

5 0
4 years ago
Miguel’s teacher asks him to color for 4/8 of his grid. He must use three colors: red blue and green. There must be more green s
Lorico [155]
2/8 can be green, 1/8 can be red, and 1/8 can be blue. The amount of green is greater then the red section and it all adds up to 4/8 or 1/2.
8 0
4 years ago
The beggining balance on the monthly Bank statement por peytons checking account das 346.19, and the ending balance das 198.34.
aleksandrvk [35]
Peyton started the month with $346.19, spent $147.95 during the month, and ended up with $198.34.  If Peyton made no deposits during the month, then $147.95 represents the sum of his expenditures during the month.

5 0
3 years ago
Read 2 more answers
Can someone help me
rodikova [14]

Try this explanation:

Note, in the 1st row given '9x', in the 2d one - '9(0)', then it means the substitution '0' instead of 'x'. In other words <u>x=0</u> !

answer: x-intercept is '0', y-intercept is '12'

3 0
3 years ago
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