$78.17 rounds to $78
15% of $78 = $11.70 which rounds to $12
Answer:
since there are 30 students as a whole and 20 boys make up part of the class, you can assume that there are 10 girls in the class. since the mean mark for boys is 62 I think the mean mark for girls would be 8%
Step-by-step explanation:
Answer:
541.5
Step-by-step explanation:
100% = 570
10%= 57
5%= 28.5
100% (570) - 5%(28.5) = 541.5
Answer:
260.1615 ; 70.688 ; (53.787 ; 103.304)
Step-by-step explanation:
Answer:
Step-by-step explanation:
Data:
242.87
260.93
194.19
260.76
355.36
346.32
165.37
250.08
326.76
283.56
212
284.08
139.16
436.72
240.87
310.41
223.73
181.25
238.2
250.61
Using calculator :
Sample mean = ΣX / n
Sample mean = 5203.23 / 20
Sample mean, m = 260.1615
Sample mean, m = 260.2
Sample standard deviation (s) :
Σ(X - m) / n - 1
= 70.688
= 70.7
((n-1)*s²) / ²0. 975, 19 ; ((n-1)*s²) / ²0.025, 19
95% confidence interval :
(53.787 ; 103.304)
