Question

what is the average of first 25 multipls of 5?​

Answer 1

Answer:

125

Step-by-step explanation:

125 is answer_____________------------______

Answer 2

Answer:

65

Step-by-step explanation:

First multiple of 5, a1 = 5

difference between multiples, d = 5

Number of terms, n = 25

Find the sum of the first 25 multiples:

Sn = n/2[2a+(n-1)d]

S25 = 25/2 [2(5) + (25 - 1)5]

S25 = 12.5 [10 + 120]

S25 = 12.5[130]

S25 = 1625

Find the average:

Average = Sum/n

Average = 1635/25

Average = 65

Answer: 65