Mathematics
The data regarding the number of patients attending a hospital in a month are as given below.
| No. of patients | No. of days |
|---|---|
| 10-20 | 5 |
| 20-30 | 2 |
| 30-40 | 7 |
| 40-50 | 9 |
| 50-60 | 2 |
| 60-70 | 5 |
Find the mean number of patients (using short method and by taking assumed mean as 45). Give your answer, correct to two significant figures.
Statistics
6 Likes
Answer
| No. of patients (Class) | Class mark (x) | No. of days (f) | d = x - A | fd |
|---|---|---|---|---|
| 10-20 | 15 | 5 | -30 | -150 |
| 20-30 | 25 | 2 | -20 | -40 |
| 30-40 | 35 | 7 | -10 | -70 |
| 40-50 | A = 45 | 9 | 0 | 0 |
| 50-60 | 55 | 2 | 10 | 20 |
| 60-70 | 65 | 5 | 20 | 100 |
| Total | Σf = 30 | Σfd = -140 |
Mean = A +
= 45 +
= 45 + (-4.67)
= 40.33 ≈ 40
Hence, mean = 40.
Answered By
2 Likes
Related Questions
The quadratic equation x2 + x + p = 0 has real and distinct roots, find the value of p.
The given figure shows two triangles ABC and AMP, right angled at points B and M respectively.
(i) Prove that △ ABC is similar to △ AMP.
(ii) If AC = 10 cm, AP = 12 cm, AM = 7.2 cm and PM = 9.6 cm; find BC and AB.
The following table shows the GST rates, the marked price and number of articles A, B and C brought.
Articles Marked price GST Rate No. of articles A ₹ 2,000 12% 2 B ₹ 5,000 5% 2 C ₹ 8,000 5% 1 Find the total amount to be paid.
O is the center of the circumcircle of △ XYZ. Tangents at points X and Y meet each other at point T. If ∠XOZ = 140° and angle XTY = 80°, find angle ZXY.
