30% , as:
Let the percentage of people preferring wooden skateboards be 'x'.
Therefore, x/100*643=209
x/100=209/643
x=209*100/643
x=20900/643
x=32.50.......
By rounding it off to 30, we get 30% as answer.
Answer:
Step-by-step explanation:
From the information given,
Mark: 6,7,8,9,10
frequency:5,4,7,10,4
a) Range = highest mark - lowest mark
Range = 10 - 6 = 4
b) The number of students in the group is the sum of the frequency. Therefore,
Number of students = 5 + 4 + 7 + 10 + 4 = 30 students
c) Mean mark = (mark × frequency)/total frequency
[(6 × 5) + (7 × 4) + (8 × 7) + (9 × 10) + 10 × 4)]/ 30
Mean mark = (30 + 28 + 56 + 90 + 40)/30 = 244/30
Mean mark = 8.1
40+20=60
90-60=30
30 divided by 60=0.3333
33.33% makes up the last classroom
Answer:
Ben has 225 seashells
Step-by-step explanation:
<u>Step 1: Use the ratio to see how many times the amount Andy has</u>
4 * n = 100
4n / 4 = 100 / 4
<em>n = 25 times the amount of the ratio</em>
<em />
<u>Step 2: Find out how many shells Ben has</u>
Use the 25 times the ratio to help
9 * 25
225
Answer: Ben has 225 seashells
<u>Check: See if the ratio still works</u>
Andy = 100
Ben = 225
100 : 225
(100/25) : (225/25)
4 : 9 -> Correct, so the answer is good
35 is the 20% so you multiply 35x5=175. 175 is the whole thing so you minus 175-35=140 which is the remaining money so half of that is 70