IT/024/S/L6

Solve the following simultaneous equations using matrices

x + y = 8
2x + 3y = 10

• x= 8

  y= 10

• x= 14

  y= -4

• x= 14

  y= -6

• x= 8

  y=-6

he ages of people in the checkout queue at Aldi are as follows: 23,54,2,6,20,25,21,64,19,19,75,36.

• 30.3

• 33.3

• 31,3

• 30.1

Convert 12345₁₀ to binary

(a)  

Convert to decimal 11011001₂

• 207

• 271

• 217

• 107

Convert (1056)₁₆ to an octal number.

(a)  

Calculate 1101 * 10

(a)  

11000/11

(a)  

FF3C₁₆ + 3FE2₁₆

(a)  

643₈+3757₈

(a)  

In the campaign against smallpox a doctor inquired into the number of times 150 people aged 16 and over in an Ethiopian village had been vaccinated. He obtained the following figures: never, 12 people; once, 24; twice, 42; three times, 38; four times, 30; five times, 4. What is the mean number of times those people had been vaccinated and what is the standard deviation?

• 2.41

• 2.14

• 1.27.

• 1.72