0482018 اا ااه الام

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The length of time (minutes) that a certain boy speaks on the telephone is found to be
a random phenomenon, with a probability function given by
10 = 46 ‏مجم‎

=0 otherwise

The value of A, which makes the function of a probability density function is
A) 1 B) 3 C) 18 ೧) -1/3

Basket of 15 oranges has an average weight of 200 gms. If an orange weighing
250 gms is taken out of the basket and is substituted by another weighing 235 gms,
what would be the average weight of 15 oranges now in the basket ?

A) 199 gms B) 200 gms

C) 185gms D) 205 gms

The positive square root of the arithmetic mean of squares of the deviations of the
given values from their arithmetic mean is denoted as
A) Mean deviation B) Standard deviation

00 ۹ D) Mode

A bag contains 5 white and 3 black balls. Another bag contains 4 white and 7 black
balls. A ballis randomly drawn from one of the bags and found to be black. Whatis the
probability that it is from the first bag ?

A) 3/16 B) 3/8 C) 10/19 D) 33/89

For a nommal distribution, the quartile deviation, the mean deviation and standard
deviation are approximately in the ratio
A) 10:12:15 8) 12:10:15

C) 10:15:12 D) None of these