The mean area of 7 halls is 55m².If the mean of 6 of them be 58m², find the area of the seventh all.
2 answers:
Answer:
The area of the seventh hall = 37m²
Step-by-step explanation:
for 6 halls
Mean area of 6 halls = 58m²
Let the area of the 7th hall be x
The sum of the areas of 7 halls = 348 + x - - - - - - (1)
notice that equation (1) = equation (2)
348 + x = 385
x = 385 - 348 = 37m²
Therefore, the area of the seventh hall = 37m²
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ANSWER
Find out the expression gives the percent of survey participants who chose swimming.
To proof
As given
75 girls at a summer camp were asked to complete a survey about their favorite outdoor activity.
27 girls chose swimming
32 girls chose hiking.
FORMULA
total girls = 75
girls chose swimming = 27
put in the formula
= 36%
36% of survey participants who chose swimming
Hence proved