Question

A number is selected at random from the numbers 1 to 30. What is the probability that it
is a prime number?

A new vaccine was tested on 1000 HIV patient it was found that only 12 patients
responded to the vaccine. What is the probability that this vaccine would cure HIV?

Probability of selecting a consonant from the alphabets


Find the value of K for which ‘ –K’ is zero of f(x) = x3 +kx2
-2x +k +6

Is x= 2 a zero of a polynomial p(x) = (x+2)3 – 8x + 16

. If both x – 2 and x –
1
2
are factors of px2 + 5x + r, show that p = r.

Bulbs are packed in cartons each containing 40 bulbs. Seven hundred cartons were
examined for defective bulbs and the results are given in the following table:
No of defective
bulbs
0 1 2 3 4 5 6 More than
6
Frequency 400 180 48 41 18 8 3 2
One cartoon was selected at random. What is the probability that it has (i) no defective bulb?
(ii) Defective bulb from 2 to 6? (iii) Defective bulbs less than 4?

Answer 1

Answer:

1) 11/30

Step-by-step explanation:

no of favourable events/ total number of events

= 11/30