The average number of calls received per hour by an insurance company switch board is 5. Calculate the prebolity that in a working day of 8 hours the number of calls received will be; i. exactly 36
ii. Is between 42 and 45
Calculate this exact probabilities and also the approximate Probabilities using a normal aproximation.​

Step-by-step explanation:

Q2. Choose the correct option:

1)A plastic that can be heated and remolded

a) Polythene

b) Thermosetting plastic

c) Thermoplastic

d) Polyester

2)Which of the following is a cash crop:

a) Pepper

b) Cereals

c) Banana

d) Pulses

3)is caused by a bacteria :

a) Common cold

b) Chicken pox

c) Ringworm

d) Tuberculosis

4)Ais a modern tool used to plough the land.

a) Cultivator

b) Harvester

c) A plough

d) Khurpi

5)The first antibiotic discovered was:

a) Staphylococcus

b) Streptomycin

c) Penicillin

d) Tetracycline

6)The fabric used for making bags should be:

a) Light

b)water

c) Have high tensile strength

d)All of the above

solution:

the given function is ,

      =

the three roots of this quadratic function is , 0 ,8 and 10.all the roots are real and rational.

if a quadratic equation is of the form ,

sum of the roots = a + b +c= 0+8+10=18=  

product of roots taken two at a time = a b + b c+ c a = 0+80+0=80 =  

product of roots = a b c = 0=  

there are 11 doors in a hall starting from 0 to 11.the entry in the hall is permitted through gate number 0 and exit is allowed through only gate number 8 and 10.so, three roots(0,8,10) of quadratic function is given by entry and exit route of this hall.