Johnson electronics makes calculators. consumer satisfaction is one of the top priorities of the company's management. the company guarantees the refund of money or a replacement for any calculator that malfunctions within two years from the data of purchase. it is known from past data that despite all efforts, 5% of the calculators manufactured by this company malfunction within a 2-year period. the company recently mailed 500 such calculators to its customers. find the probability that exactly 30 of the 500 calculators will be returned for refund or replacement within a 2-year period.

the probability that exactly 30 of the 500 calculators IS 0.0495

Explanation:

Given data:

number of calculators n = 500,

percentage of defected calculators p = 0.05

From Normal approximation method;

Therefore probability is

P(X= 30) = P(29.5< X< 30.5) ( from continuous correction)

=0.0495 (from standard table of Z )

the first successful, urban blues recording, selling more than 75,000 copies, was made in year 1920.

mamie smith recorded the first commercially successful example of the urban blues,   with the recording of “crazy blues”."crazy blues" was recorded on august 10, 1920, in new york city. within a month of the release of “crazy blues” it had sold 75,000 copies.

1) the stages a new product goes through from beginning to end, i.e., the stages that a product passes through from introduction through growth, maturity, and decline. 2) the time from initial research and development to the time at which sales and support of the product to customers are withdrawn. 3) the period of time during which a product can be produced and marketed profitably.

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