Question

Petroleum pollution in seas and oceans stimulates the growth of some types of bacteria. A count of the number of bacteria (per 100 milliliters) in 10 portions of seawater gave the readings given below.

50    68    51    68    56    38    58    70    69    53

(a)

Calculate the range.

(b)

Calculate x.

x =

Calculate s. (Round your answer to three decimal places.)

s =

(c)

The range is about how many standard deviations? (Round your answer to one decimal place.)

The range is approximately standard deviations.

Answer 1

A count of the number of bacteria (per 100 millilitres) in 10 portions of seawater gave the readings given below.

50    68    51    68    56    38    58    70    69    53

(a)

Maximum value = 70

Minimum value = 38

Range = Maximum value - Minimum value

Range = 70 - 38

Range = 32

(b)

	50	65.61
	68	98.01
	51	50.41
	68	98.01
	56	4.41
	38	404.01
	58	0.01
	70	141.61
	69	118.81
	53	26.01
Σ		1006.9

(c)

The range is approximately 3 standard deviations.