Question

hey please solve class 10 Algebra​

Answer 1

Step-by-step explanation:

• Given N = ∑ f1 = 90
• So f1 + f2 = 90 – 78 = 12
• Now Median = 49.2 and N is even
• Now median class is 40- 50 since mean of 45 and 46 lie in this class 40 – 50
• We have f = 25
• So h = 10
• So l = 40
• C.f = f1 + 15
• We know that l + N/2 – cf /f x h
• Substituting the values we get
• 49.2 = 40 + 45 – f1 – 15 / 25 x 10
• 49.2 – 40 = 30 – f1 / 25 x 10
• 9.2 x 25 / 10 = 30 – f1
• 30 – f1 = 23
• Or f1 = 30 – 23
• Or f1 = 7
• We have f1 + f2 = 12
• So 7 + f2 = 12
• Or f2 = 12 – 7
• Or f2 = 5

Reference link will be

https://brainly.in/question/14195186

Answer 2

Answer:

hope my attachment answer is correct