The blood platelet counts of a group of women have a bell-shaped distribution with a mean of 258.6 and a standard deviation of 65.3. (All units are 1000 cells/muL.) Using the empirical rule, find each approximate percentage below. What is the approximate percentage of women with platelet counts within 3 standard deviations of the mean, or between 62.7 and 454.5

Using the Empirical Rule, it is found that 99.7% of the women have platelet counts within 3 standard deviations of the mean.

The Empirical Rule states that:

The problem asks the percentage within 3 standard deviations, which is 99.7%.

A similar problem is given at link

< coa = 150 ( given)

as ba and bc are tangents

so oc and oa is perpendicular to cb and ab respectively because in circle normal passes through centre

so in quadrilateral oabc

< coa + < oab + < ocb + < abc = 360

150 +90+90 + < abc = 360

330 + < abc = 360

< abc = 360 -330 = 30

so < abc = 30

⭐dhruv⭐