ANSWER: a=12 b=15
Explanation: (look at work below)
4a + 1b = 63 (eq1)
5a + 3b = 105 (eq2)
-12a + -3b = -189 (subt. eq1 from eq2)
————————-
-7a = -84
a = 12
4(12) + 1b = 63 (plug in the a value)
48 + 1b = 63
b = 15
1) Mean= Sum of total Observation/ Total no.of observation
Mean= 42/6=7
option (b) 7
2)To calculate Median first arrange the numbers in a numerically ascending order.
Since, there are even no.of total Observation median will be the mean of two middlemost terms.
3,6,7,9,9,10
Middle terms are 7 and 9
Median= 7+9/2= 8
option(c) 8
Answer:
2/5
Step-by-step explanation:
4/5*1/2=4/10=2/5
-25x + 40
Step-by-step explanation:
-8 (4x-5) + 7x
-32x + 40 + 7x
-32x +7x + 40
-25x + 40
What number of students describe the first quartile?<br>
20, 18, 21, 18, 22, 24, 18, 23, 23, 24,
kykrilka [37]
Answer:
Quartile 1 is 18
Step-by-step explanation:
Arrange the numbers in order from least to greatest;
18, 18, 18, 20, 21, 22, 23, 23, 24, 24
Find the Median = (21+22)/2= 21.5
Find the median (Q1) between 21.5 and 18 = 18
Find the median (Q2) between 21.5 and 24 = 23
