how to fine artmetic mean giving sumati on(x-10)=230 And n=50
Answers
Answer:
Step-by-step explanation:
Mean height = Sum of the heights of the runners/number of runners
= (160 + 137 + 149 + 153 + 161)/5 cm
= 760/5 cm
= 152 cm.
2. Find the mean of the first five prime numbers.
Solution:
The first five prime numbers are 2, 3, 5, 7 and 11.
Mean = Sum of the first five prime numbers/number of prime numbers
= (2 + 3 + 5 + 7 + 11)/5
= 28/5
= 5.6
Hence, their mean is 5.6
3. Find the mean of the first six multiples of 4.
Solution:
The first six multiples of 4 are 4, 8, 12, 16, 20 and 24.
Mean = Sum of the first six multiples of 4/number of multiples
= (4 + 8 + 12 + 16 + 20 + 24)/6
= 84/6
= 14.
Hence, their mean is 14.
5. If the mean of 9, 8, 10, x, 12 is 15, find the value of x.
Solution:
Mean of the given numbers = (9 + 8 + 10 + x + 12)/5 = (39 + x)/5
According to the problem, mean = 15 (given).
Therefore, (39 + x)/5 = 15
⇒ 39 + x = 15 × 5
⇒ 39 + x = 75
⇒ 39 - 39 + x = 75 - 39
⇒ x = 36
Hence, x = 36.